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Rh Hively v. Ivy Tech Community College of Ind., 853 F. 3d 339, 357 (CA7 2017) (Posner, J., concurring). The Court seemingly has the same opinion about our colleagues on the Courts of Appeals, because until 2017, every single Court of Appeals to consider the question interpreted Title VII’s prohibition against sex discrimination to mean discrimination on the basis of biological sex. See Part III–C, infra. And for good measure, the Court’s conclusion that Title VII unambiguously reaches discrimination on the basis of sexual orientation and gender identity necessarily means that the EEOC failed to see the obvious for the first 48 years after Title VII became law. Day in and day out, the Commission enforced Title VII but did not grasp what discrimination “because of ... sex” unambiguously means. See Part III–C, infra.

The Court’s argument is not only arrogant, it is wrong. It fails on its own terms. “Sex,” “sexual orientation,” and “gender identity” are different concepts, as the Court concedes. Ante, at 19 (“homosexuality and transgender status are distinct concepts from sex”). And neither “sexual orientation” nor “gender identity” is tied to either of the two biological sexes. See ante, at 10 (recognizing that “discrimination on these bases” does not have “some disparate impact on one sex or another”). Both men and women may be attracted to members of the opposite sex, members of the same sex, or members of both sexes. And individuals who are born with