*207We consider here whether the termination of an employee, allegedly in response to malicious rumors of sexual misconduct, can support claims for sex discrimination. In principle, such claims may well be viable, particularly under the broad statutory cause of action provided by Title VII of the Civil Rights Act of 1964 ("Title VII"). The claims before us on appeal, however, were brought pursuant to 42 U.S.C. § 1983 and the Equal Protection Clause of the Fourteenth Amendment. The standards for such claims, particularly with respect to vicarious liability and causation, are distinct from those brought under Title VII. Moreover, Defendants in this case had the additional benefit of qualified immunity, which the District Court did not address independently. Accordingly, we write to clarify the differences between discrimination claims brought under Title VII and those brought under § 1983, and to again emphasize the importance of properly applying the doctrine of qualified immunity.
Defendants-Appellants James Norris and Nicole Scholl ("Norris" and "Scholl"; jointly, "Defendants") appeal from an April 17, 2018 order of the United States District Court for the Northern District of New York (David N. Hurd, Judge ), denying in part their motion for summary judgment. Defendants, who are athletics officials at Binghamton University, the State University of New York ("Binghamton"), claim that they were erroneously denied qualified immunity in a discrimination suit brought by Plaintiff-Appellee Elizabeth Naumovski ("Naumovski" or "Plaintiff"), previously an assistant women's basketball coach at Binghamton. Because the District Court erroneously conflated the distinct Title VII and § 1983 standards for both vicarious liability and causation, we REVERSE the District Court's order with respect to the § 1983 claims against Defendants, we ENTER judgment for Defendants, and we REMAND the cause for further proceedings consistent with this opinion.
1. BACKGROUND1
A. The 2008-2009 Season: Rumors Begin
In June 2008, Elizabeth Naumovski, a Canadian citizen, began her employment at Binghamton as an assistant coach of its women's basketball team. During the 2008-2009 season, Naumovski worked as one of the team's three assistant coaches under the direction of head coach Nicole Scholl.
In December 2008, rumors began to circulate among student-athletes and their families that Naumovski was engaged in an "inappropriate relationship" with a gay, female student-athlete, identified as "J.W." Naumovski first learned of these rumors in January 2009, which was about the same time they reached Scholl. But according to Scholl, the rumors never referred to a sexual relationship between Naumovski and J.W.; rather, they merely suggested that Naumovski was demonstrating "favoritism"
*208toward J.W. Moreover, Scholl claims that she never believed Naumovski was having an intimate or sexual relationship with J.W.
Naumovski recalls discussing allegations of an inappropriate sexual relationship with Scholl.2 Naumovski further recalls Scholl reassuring her that she did not believe the rumors. Naumovski claims that Scholl failed to take any significant action to stop the rumors.
Naumovski's performance evaluation for the 2008-2009 season noted no performance deficiencies. Naumovski's contract was renewed for the following year, and she received a salary increase.
B. The 2009-2010 Season: Rumors Escalate
In late September 2009, shortly after the start of the academic year, a student-athlete on the women's basketball team approached James Norris (then Binghamton's Senior Associate Athletic Director) and informed him that Naumovski was rumored to be engaged in an "inappropriate relationship" with J.W. Like Scholl, Norris states that he understood the rumors to refer to a relationship of favoritism between a coach and a student-athlete, rather than to a sexual relationship between the two. Norris recalls discussing the rumors with Joel Thirer, then Athletics Director, who assured him that the allegations were the baseless fabrications of disgruntled former members of the Binghamton Athletics community. On September 30, 2009, Norris replaced Thirer as Interim Athletics Director.
In October 2009, the athletics department began to escalate its response to the Naumovski rumors. Scholl imposed various restrictions on interactions between coaches and student-athletes to avoid any perception of impropriety. As a result of the increased scrutiny triggered by these restrictions, Naumovski began to suffer from depression and stress-induced weight loss.
In early October, Naumovski met with Norris to address the rumors and reassure him that she was not engaged in an inappropriate relationship. According to Naumovski, Norris told her that "your problem is that you're a single female in your mid-30s."3
The rumors persisted through February 2010. Norris continued to receive complaints of Naumovski's alleged favoritism, while Scholl allegedly noticed Naumovski ignoring certain students. Scholl also explains that, during this time, she and Naumovski began to clash. Scholl felt that Naumovski was trying to undermine her leadership of the team. Naumovski does not deny tension between herself and Scholl; rather, she claims that any such tension ceased after a February 9, 2010 meeting with Scholl. Naumovski further claims that Scholl and Norris never expressed any additional concerns about her coaching performance after that time.
C. Naumovski Is Fired
During a phone call on February 21, 2010, Scholl and Norris agreed to terminate *209Naumovski's employment. The decision was purportedly based on Naumovski's demonstrated favoritism toward certain student-athletes and the disruptive impact of her workplace conflicts with Scholl. Scholl and Norris agreed that they would inform Naumovski of their decision in March, after the athletic season concluded. During the intervening weeks, Norris continued to receive student complaints about Naumovski.
On February 23, J.W.'s family received an anonymous, vulgar letter accusing her of "screwing" Naumovski. J.W. informed Naumovski of the letter the following day. Around the same time, Naumovski learned from a different student that several student-athletes had been complaining about her to Norris.
On March 2, J.W.'s mother called Norris to request a meeting, and the two agreed to meet after the conclusion of the season. Their accounts differ about whether J.W.'s mother informed Norris of the letter during this initial phone call.
On March 8, Naumovski met with a union representative, Darryl Wood, who assured her that, before acting on the allegations, the university would conduct an investigation and notify her of the results by letter from "Human Resources." That proved wrong. On March 9, Norris contacted Naumovski to schedule a meeting for the following day. At that March 10 meeting, Norris informed Naumovski that she was being fired "for performance reasons," but offered her the opportunity to resign "voluntarily."4 Naumovski resigned.
D. The Instant Action
On October 4, 2010, Naumovski filed a discrimination charge with the New York State Division of Human Rights and the U.S. Equal Employment Opportunity Commission (the "EEOC"). On June 17, 2011, the EEOC issued Naumovski a Notice of Right to Sue letter. On September 15, 2011, Naumovski filed suit against Scholl, Norris, Binghamton, SUNY, and two anonymous individuals, alleging discrimination based on her sex, her perceived sexual orientation, and her national origin, in violation of Title VII, Title IX, the Equal Protection Clause and the First Amendment of the United States Constitution (as enforceable through 42 U.S.C. § 1983 ), the New York State Constitution, and the New York State Human Rights Law.
Following discovery, Defendants moved for summary judgment on all claims. The motion remained pending for several years. Finally, on April 17, 2018, the District Court granted the motion in part and denied it in part. Specifically, the District Court granted summary judgment to the institutional defendants (namely, Binghamton and SUNY) on all constitutional claims, but permitted several statutory claims to proceed to trial. With respect to Scholl and Norris, the District Court dismissed all claims except for Naumovski's sex-based disparate treatment and hostile work environment claims under § 1983.5 Although Scholl and Norris expressly invoked qualified immunity in their motion for summary judgment, the District Court did not address this argument in its Memorandum-Decision and Order.
*210On May 9, 2018, Scholl and Norris moved for reconsideration of the District Court's partial denial of summary judgment. Again, Scholl and Norris specifically invoked qualified immunity. The District Court nevertheless denied the motion due to its untimeliness under the local rules and because it did not raise any new issues. On May 17, 2018, Norris and Scholl appealed the District Court's April 17, 2018 order based on their claimed entitlement to qualified immunity.
2. DISCUSSION
A. Jurisdiction and Standard of Review
"Ordinarily, orders denying summary judgment do not qualify as 'final decisions' subject to appeal."6 It is well-settled, however, that "a district court's denial of a claim of qualified immunity, to the extent that it turns on an issue of law, is an appealable 'final decision' within the meaning of 28 U.S.C. § 1291 notwithstanding the absence of a final judgment."7 Here, Norris and Scholl argue that the District Court erred as a matter of law in denying-or, more accurately, by failing to address-their claim to qualified immunity.8 Jurisdiction is therefore proper.9
We review de novo a district court's denial of summary judgment based on a claim of qualified immunity.10 When considering qualified immunity at the summary judgment stage, courts must "construe all evidence and draw all reasonable inferences in the non-moving party's favor."11
B. Qualified Immunity
A government official is entitled to immunity from suit whenever (1) his conduct "did not violate clearly established law," or (2) "it was objectively reasonable for [the official] to believe that his action did not violate such law."12 Government officials are thus shielded from liability whenever their actions are based on reasonable mistakes of law or fact.13
*211When analyzing whether the right violated was "clearly established," the Supreme Court has repeatedly (and recently) reminded us that clearly established law must be "particularized" to the facts of the case and must not be defined "at a high level of generality."14 In other words, officials only forfeit their immunity when "existing precedent ... [has] placed the statutory or constitutional question beyond debate"15 and that precedent has been recognized "under similar circumstances."16 Qualified immunity thus protects "all but the plainly incompetent" and those who "knowingly violate the law."17
When addressing a claim of qualified immunity, it is often appropriate (but not required) to first address the "threshold inquiry" of whether the plaintiff has alleged a violation of federally protected rights "at all."18 If the plaintiff has demonstrated such a violation, we must still determine whether the application of that right to the circumstances at issue was "clearly established" at the time of the conduct,19 and whether an "objectively reasonable" officer would have known that his conduct amounted to such a violation.20 If our resolution of any of these inquiries is negative, we must conclude that an official is shielded by qualified immunity and entitled to summary judgment.
C. Claims of Sex Discrimination in Public Employment under § 1983 and the Fourteenth Amendment
In order to analyze Defendants' claims of qualified immunity, we must first clarify the contours (or at least the "clearly established" contours) of the right at issue on this appeal.
The only claims before us are Naumovski's two remaining § 1983 claims against Norris and Scholl, both of which allege violations of the Fourteenth Amendment's *212Equal Protection Clause:21 (1) disparate treatment on account of sex, and (2) subjection to a hostile work environment on account of sex.
A plaintiff who claims sex discrimination in public employment in violation of the Fourteenth Amendment may bring suit pursuant to § 1983.22 Such § 1983 discrimination claims parallel Title VII discrimination claims in many respects.23 For instance, as with Title VII claims, a plaintiff may allege both traditional "disparate treatment" claims and "hostile work environment" claims. The basic elements of such claims, whether pursued under Title VII or § 1983, are similar: (1) a plaintiff claiming disparate treatment under either statute must plausibly allege that she suffered an "adverse employment action" taken "because of" her sex,24 and (2) a plaintiff claiming a hostile environment must plausibly allege offensive conduct based on sex that was "sufficiently severe or pervasive to alter the conditions of the victim's employment and create an abusive working environment."25
Despite these similarities, § 1983 and Title VII claims differ in important ways.26 First, and most obviously, a plaintiff advancing a claim pursuant to § 1983 must plausibly allege that "the alleged deprivation was committed by a person acting under color of state law."27 Title VII has no such requirement. Second, unlike a Title VII claim, which may be brought only against the employing entity, a § 1983 claim "can be brought against an[y] individual" responsible for the discrimination.28 Third, while an employer may be liable under Title VII for any discriminatory conduct that can properly be attributed to the employer through agency principles,29 § 1983 does not permit such vicarious liability. "If [an individual] defendant has not personally violated a plaintiff's constitutional rights, the plaintiff cannot succeed on a § 1983 action against the defendant."30
*213We emphasize now a fourth crucial distinction between Title VII and § 1983 claims: the required degree of causation.
As the Supreme Court recently clarified, the disparate treatment provision of Title VII is unusual in that it incorporates a "lessened causation standard."31 Under Title VII, a plaintiff may succeed simply by establishing that sex (or another protected characteristic) was a "motivating factor for any employment practice, even though other factors also motivated the practice."32 Thus, even if an employer can establish that legitimate, non-discriminatory reasons also provided sufficient reason for the adverse action, the employer may still be liable under Title VII. In other words, an employer's insistence that he would have terminated the plaintiff anyway is no defense.
This "lessened causation standard" is the product of deliberate and specific legislation. Indeed, prior to 1991, an employer "could escape liability if it could prove that it would have taken the same employment action in the absence of all discriminatory animus."33 In the Civil Rights Act of 1991, however, Congress added a new provision to Title VII that reduced the causation standard under that law to require merely "motivating factor" for disparate treatment claims.34 Title VII, therefore, now differs markedly from ordinary tort legislation with respect to causation.
Not so § 1983. As the Supreme Court has explained, a "standard requirement of any tort claim" is that plaintiff show "that the harm would not have occurred in the absence of-that is, but for-the defendant's conduct."35 This standard, the Supreme Court has explained, is "the background against which Congress legislate[s]" and "the default rules it is presumed to have incorporated."36 Indeed, "but-for" causation has long been a standard prerequisite in § 1983 claims generally.37 Congress has passed no legislation reducing the causation standard for employment discrimination suits brought under § 1983.
*214It follows, therefore, that a plaintiff pursuing a claim for employment discrimination under § 1983 rather than Title VII must establish that the defendant's discriminatory intent was a "but-for" cause of the adverse employment action or the hostile environment. It is insufficient to establish simply that invidious discrimination was "a motivating factor" of the offending conduct.38 Accordingly, a court considering a § 1983 claim at summary judgment must determine whether, construing the evidence in a light most favorable to the plaintiff, a reasonable jury could find that the adverse employment action would not have occurred "but-for" sex discrimination.
This important distinction is implemented easily through the familiar framework set forth in McDonnell Douglas Corp. v. Green .39 Indeed, courts already employ the McDonnell Douglas framework to analyze § 1983 claims.40 When doing so, however, courts must account for a § 1983 plaintiff's higher burden of producing evidence from which a jury could infer that the individual's discriminatory intent was a "but-for" cause of the adverse employment action.
Accordingly, at the third step of the McDonnell Douglas analysis, a plaintiff asserting a § 1983 claim bears a higher burden in establishing that the employer's alternative, nondiscriminatory reason for the adverse employment action is "pretextual." To establish "pretext" under Title VII, a plaintiff need only establish "that discrimination played a role in an adverse employment decision."41 In other words, a Title VII plaintiff need only prove that the employer's stated non-discriminatory reason was not the exclusive reason for the adverse employment action.42 By *215contrast, to establish "pretext" under § 1983, a plaintiff must establish that the employer's stated reason would not, alone, constitute a sufficient basis for pursuing an adverse action. In other words, a § 1983 plaintiff must establish that the employer's stated non-discriminatory reason is either false or inadequate to support the adverse employment action.
D. Application
We now apply these principles to Naumovski's two § 1983 sex discrimination claims against Norris and Scholl.
First, we note that, as employees of public universities acting in their official capacities, Norris and Scholl are indisputably subject to suit under § 1983 and are "government officials" for the purposes of qualified immunity.43
In this case, however, our review of the District Court's (implicit) rejection of Norris's and Scholl's claims of qualified immunity is complicated by several factors. First , the District Court never addressed the claims of qualified immunity in its Memorandum-Decision and Order; it is therefore impossible to review its specific reasoning in denying relief on this ground. Second , while both the complaint and the District Court's Memorandum-Decision and Order conclude that Defendants' alleged conduct constitutes sex discrimination (either through disparate treatment or subjection to a hostile environment), neither explains precisely how Defendants' conduct can be so construed. Third, the District Court opinion conflates its analysis of Naumovski's Title VII and § 1983 claims, rendering our task of reviewing only the § 1983 claims more difficult.
In the absence of a clear District Court ruling, we are left to reconstruct the logic underlying its decision as best we can. After doing so, we conclude that no theory can sustain the District Court's implicit denial of Defendants' qualified immunity. We discuss each possible theory in turn.
1. Disparate Treatment Claim
a. Defendants Acted Pursuant to their Own Sex-Based Animus
The simplest interpretation of Naumovski's § 1983 claim for "discrimination and disparate treatment" is that Defendants allegedly acted to terminate her employment because of animus toward women.44 Here, the primary basis for inferring such animus appears to be Naumovski's sworn attestation that Norris told her "your problem is that you're a single female in your mid-30s."45 Assuming that Norris made that statement, and that its content could be understood to disparage a subset of women,46 the statement is insufficient evidence from which a jury could *216infer Norris's discriminatory intent. As we have observed, "stray remarks, even if made by a decisionmaker, do not constitute sufficient evidence to make out a case of employment discrimination."47 Norris's one-off comment is precisely the sort of "stray remark" that is insufficient to support an inference of discriminatory intent.
The District Court appears to acknowledge that Norris's alleged statement, by itself, is insufficient to defeat a motion for summary judgment. It therefore appeals to "other indicia of discrimination" to bolster the significance of this otherwise stray comment.48 The only "other indicia," however, is evidence suggesting that Scholl and Norris interpreted the rumors as alleging a sexual relationship between Naumovski and J.W., rather than mere favoritism from one to the other.49 The invocation of such evidence is unavailing. Even if we assume Scholl and Norris interpreted the allegations against Naumovski as sexual in nature, that fact provides no additional support for a conclusion that Scholl's and Norris's own actions were based on discriminatory animus toward women generally or any subcategory of female employees in particular.
Insofar as the District Court denied summary judgment based on the belief that a reasonable jury could find that Norris and Scholl acted with discriminatory animus on account of Naumovski's sex, the record does not support such a finding. Thus, a claim based on that theory should not have survived a motion for summary judgment.
b. Sex Stereotyping: Conscious Biased Judgments of Sexual Behavior
Another interpretation of Naumovski's § 1983 claim is that Norris and Scholl engaged in invidious sex stereotyping .50
On this theory, Norris's "single female in your mid-30s" remark,51 coupled with Norris's and Scholl's allegedly inappropriate reaction toward the rumors,52 might raise an inference of sex stereotyping, especially in light of Naumovski's apparently satisfactory performance record.53 In other *217words, Norris and Scholl stereotyped Naumovski based on her sex (possibly in combination with other characteristics) as more likely to have engaged in a romantic or sexual relationship with J.W.54 Defendants then fired Naumovski (at least in part) because of their wrongful and discriminatory belief that she engaged in sexual impropriety with a student and, subsequently, attempted to conceal that stereotyping played any role in their termination decision.
As a general matter, we agree that a plaintiff may establish a claim of disparate treatment by demonstrating that an employer acted against her because of a conscious belief that, on account of her sex, she was more likely to have engaged in sexual misconduct.55
Here, however, Naumovski cannot succeed on such a theory. As noted above, the claims before us were brought under § 1983 and the Fourteenth Amendment, not Title VII. Naumovski must therefore establish not only that Defendants' sex stereotyping biases played some role in the decision to terminate her, but that this stereotyping was a "but-for" cause of that decision.56 As we explained above, a § 1983 plaintiff's burden at the third stage of the McDonnell Douglas analysis is not simply to establish that discrimination played some role in her termination, but that it played a decisive role. In other words, Naumovski must establish that a reasonable jury could find that Defendants would not have terminated her based on their stated reasons alone.
To be sure, there may well be cases in which misconduct findings based on sex stereotyping meet the "but-for" discrimination standard. Here, however, we do not think that the evidence, even construed in the light most favorable to Naumovski, satisfies that standard.
First, Norris's alleged "single female in your mid-30s" comment provides only scant support for the proposition that Norris believed that single, mid-30's women are more prone to engage in sexual misconduct with a female student-athlete than are their male counterparts. And as we have explained above, isolated remarks "do not constitute sufficient evidence to make out a case of employment discrimination."57
Second, Naumovski has not produced competent evidence establishing that Defendants' stated reason for her termination-"performance reasons"58 -was false or inadequate. Indeed, Naumovski admits that Scholl informed her of "a concern by some players that they weren't being coached equally."59 Similarly, Naumovski admits that at a February meeting, Scholl commented that Naumovski's emotional state was "affecting [her] work."60
Moreover, while Naumovski points to her satisfactory 2008-2009 performance *218evaluation as evidence of pretext, Defendants' account of Naumovski's subsequent performance issues between October 2009 and February 2010 remains substantially undisputed. For instance, Naumovski does not materially dispute that Scholl's personality and coaching style clashed with her own.61 On the contrary, Naumovski's statement that "my relationship with Defendant Scholl improved" after the February 9, 2010 meeting implies that the relationship was in need of improvement.62 Naumovski has, therefore, failed to produce evidence that would permit a finding that Defendants' stated reasons for firing her were false or insufficient.
In sum, while the District Court concluded that the record sufficed "to permit a rational finder of fact to infer that defendants' decision to terminate her was more likely than not motivated in part by sex-based discrimination,"63 it did not conclude that a rational finder of fact could infer that such discrimination was a but-for cause of her termination. We conclude that the record before us does not permit a reasonable jury to infer that sex-based stereotyping by Defendants was a "but-for" cause of Naumovski's firing.
The record therefore does not support a claim that Defendants' conduct violated Naumovski's constitutional rights. Accordingly, insofar as the District Court interpreted Naumovski as advancing a "sex stereotyping" theory of sex discrimination, it erred in denying Defendants' motion for summary judgment.
c. Discrimination on the Basis of Sexual Orientation
Naumovski's complaint does not explicitly allege sexual orientation discrimination in its enumeration of her § 1983 claims.64 Nevertheless, the District Court appears to have so interpreted her claims. Indeed, the District Court concluded that "Plaintiff has established that she is a member of several protected classes including ... being perceived as gay."65
We need not decide whether the District Court erred in so construing Naumovski's complaint. Even if Naumovski had stated a sexual orientation discrimination claim, Defendants would have qualified immunity from such a claim.66
To the extent the District Court relied on our recent en banc decision in Zarda v. Altitude Express, Inc. in recognizing Naumovski's arguable sexual orientation discrimination claims,67 it erred for at least two reasons. First, Zarda specifically addressed the question of whether Title VII prohibits sexual orientation discrimination. It did not address whether the Constitution prohibits sexual orientation discrimination. Thus, Zarda is only "clearly established law" for statutory sexual orientation *219discrimination claims under Title VII. It does not, however, "clearly establish" constitutional (i.e. § 1983 ) sexual orientation discrimination claims.
Second, even if it were reasonable for the District Court to interpret Zarda as establishing a sexual orientation discrimination claim under the Constitution,68 the conduct at issue in this case predated the issuance of the Zarda decision. Prior to Zarda , our Court had expressly declined to recognize sexual orientation discrimination claims under Title VII, much less the Constitution.69 Thus, if anything, the "clearly established law" at the time Defendants terminated Naumovski's employment was that sexual orientation discrimination was not a subset of sex discrimination. Insofar as the District Court relied on Zarda , therefore, Defendants were surely entitled to qualified immunity.70
Nor could the District Court rely on freestanding constitutional principles separate from Zarda . To date, neither this court nor the Supreme Court has recognized § 1983 claims for sexual orientation discrimination in public employment. Moreover, when the conduct in this case occurred, neither of the Supreme Court's landmark same-sex marriage cases- United States v. Windsor71 and Obergefell v. Hodges72 -had been decided. It was, therefore, not yet clear that all state distinctions based on sexual orientation were constitutionally suspect.73
Thus, even if it is possible today that sexual orientation discrimination in public employment may be actionable under § 1983, at the time of the challenged conduct here such a constitutional prohibition was not yet "clearly established."74 Accordingly, Defendants were entitled to qualified immunity on discrimination claims based on an arguable sexual orientation theory.
d. Liability for Students' Discriminatory Intent
As we explained above, we do not think Naumovski has established that Defendants' own discriminatory animus was a "but-for" cause of her termination. Nonetheless, the District Court's Memorandum-Decision and Order may be read to suggest that Defendants are liable for terminating *220Naumovski pursuant to the discriminatory intent of the students circulating the rumors.75
Here again, however, the distinctions between Title VII and § 1983 are crucial.
A Title VII plaintiff can succeed on a discrimination claim against an employer "even absent evidence of illegitimate bias on the part of the ultimate decision maker, so long as the individual shown to have the impermissible bias played a meaningful role in the [decision-making] process."76 Even in Title VII retaliation cases (which require a higher standard of causation than disparate treatment cases77 ), we have held that if an employee "manipulates an employer into acting as a mere conduit for his retaliatory intent," the employee's intent can be imputed to the employer under a "negligence" (i.e., a "knew or should have known") standard.78 And under Title VII, we have adopted agency principles to impute the behavior of student-athletes to their coaches.79
Here, we assume arguendo that students' malicious false accusations of sexual misconduct by Naumovski may raise an inference of sex-based animus.80 Accordingly, if the student athletes who circulated false rumors thereby manipulated Defendants "into acting as a mere conduit"81 for the students' sex discriminatory animus-i.e. , if Defendants' negligence led them to terminate Naumovski as a result of the student-athletes' discriminatory intent-Binghamton's liability under Title VII is at least arguable.
Here, however, the claims on appeal were brought under § 1983 and the Fourteenth Amendment rather than Title VII. Accordingly, Naumovski's claim fails for two reasons. First, even if we assume that those students who initiated false rumors relied on Naumovski's sex in circulating the rumors, Naumovski failed to adduce evidence showing that her sex qualified as a "but-for" cause, rather than simply a motivating factor, of Defendants' adverse *221employment action. As we have explained above, § 1983 claims require "but-for" causation. Second, while the Supreme Court instructs that traditional agency principles can determine liability under Title VII,82 no comparable vicarious liability applies to claims brought under § 1983.83
Thus any claims based on Defendants' negligent facilitation of students' sex discriminatory intent necessarily fails, and Defendants should not have been denied summary judgment on that theory.84
2. Hostile Work Environment
Finally, Naumovski's § 1983 "hostile work environment" claim fails for similar reasons. Here too, the District Court appears to have conflated the § 1983 and Title VII inquiries,85 and thus mistakenly denied summary judgment to Defendants.
The District Court devoted just two sentences to justifying this conflation, citing Raspardo v. Carlone86 and Demoret v. Zegarelli87 for the proposition that the "standard for showing a hostile work environment under § 1983 and the Equal Protection Clause [is] essentially the same as under Title VII."88
Our precedents do not support such a sweeping statement. As explained above, § 1983 differs from Title VII in several respects, including the standard of causation and the availability of vicarious liability.89 Our precedents, including Raspardo and Demoret , simply indicate that, for claims arising under both laws, the level of severity to demonstrate a hostile work environment is similar.90 Our precedents do *222not , however, imply identity between the claims in all other respects.
In this case, the differences between viable hostile work environment claims under Title VII and under § 1983 are crucial. This is because Naumovski has failed to produce evidence, required for a § 1983 claim, establishing: (1) that Defendants' own conduct (as opposed to that of the students) created a sufficiently hostile work environment; and (2) that Defendants' conduct was a "but-for" cause of the hostile work environment. Instead, Naumovski (and the District Court) relied on the (Title VII) principle that a negligent employer may be held liable for the conduct of a supervisee. Naumovski and the District Court then imputed the allegedly sex-discriminatory conduct of student-athletes to the Defendants.91 Even if this might be permissible in the Title VII context, it is legal error with respect to § 1983 claims.
Because Naumovski has failed to produce evidence that could establish that Defendants themselves clearly violated her Fourteenth Amendment rights, Defendants were entitled to summary judgment on the basis of qualified immunity on the hostile work environment claim as well.
III. CONCLUSION
To summarize, we hold as follows:
(1) Section 1983 claims for discrimination in public employment require plaintiffs to establish that the defendant's discriminatory intent was a "but-for" cause of the adverse employment action.
(2) Section 1983 claims for discrimination in public employment cannot be based on a respondeat superior or "cat's paw" theory to establish a defendant's liability.
(3) Defendants were entitled to qualified immunity because, even when interpreted in the light most favorable to Naumovski, the record cannot support the conclusion that they violated her "clearly established" constitutional rights
For the foregoing reasons, we REVERSE the District Court's April 17, 2018 order with respect to the § 1983 claims against Defendants, we ENTER judgment for Defendants, and we REMAND the cause for further proceedings consistent with this opinion.