Opinion of the Court
male employee for no reason other than the fact he is attracted to men, the employer discriminates against him for traits or actions it tolerates in his female colleague. Put differently, the employer intentionally singles out an employee to fire based in part on the employee’s sex, and the affected employee’s sex is a but-for cause of his discharge. Or take an employer who fires a transgender person who was identified as a male at birth but who now identifies as a female. If the employer retains an otherwise identical employee who was identified as female at birth, the employer intentionally penalizes a person identified as male at birth for traits or actions that it tolerates in an employee identified as female at birth. Again, the individual employee’s sex plays an unmistakable and impermissible role in the discharge decision.
That distinguishes these cases from countless others where Title VII has nothing to say. Take an employer who fires a female employee for tardiness or incompetence or simply supporting the wrong sports team. Assuming the employer would not have tolerated the same trait in a man, Title VII stands silent. But unlike any of these other traits or actions, homosexuality and transgender status are inextricably bound up with sex. Not because homosexuality or transgender status are related to sex in some vague sense or because discrimination on these bases has some disparate impact on one sex or another, but because to discriminate on these grounds requires an employer to intentionally treat individual employees differently because of their sex.
Nor does it matter that, when an employer treats one employee worse because of that individual’s sex, other factors may contribute to the decision. Consider an employer with a policy of firing any woman he discovers to be a Yankees fan. Carrying out that rule because an employee is a woman and a fan of the Yankees is a firing “because of sex” if the employer would have tolerated the same allegiance in a male employee. Likewise here.
