Page:Bostock v. Clayton County (2020).pdf/58

Rh of racial discrimination in this country not to understand what is at stake in such cases .... A prohibition on ‘racemixing’ was ... grounded in bigotry against a particular race and was an integral part of preserving the rigid hierarchical distinction that denominated members of the black race as inferior to whites.” 883 F. 3d, at 158–159 (Lynch, J., dissenting).

Discrimination because of sexual orientation is different. It cannot be regarded as a form of sex discrimination on the ground that applies in race cases since discrimination because of sexual orientation is not historically tied to a project that aims to subjugate either men or women. An employer who discriminates on this ground might be called “homophobic” or “transphobic,” but not sexist. See Wittmer v. Phillips 66 Co., 915 F. 3d 328, 338 (CA5 2019) (Ho, J., concurring).

The opinion of the Court intimates that the term “sex” was not universally understood in 1964 to refer just to the categories of male and female, see ante, at 5, and while the Court does not take up any alternative definition as a ground for its decision, I will say a word on this subject.

As previously noted, the definitions of “sex” in the unabridged dictionaries in use in the 1960s are reproduced in Appendix A, infra. Anyone who examines those definitions can see that the primary definition in every one of them refers to the division of living things into two groups, male and female, based on biology, and most of the definitions further down the list are the same or very similar. In addition, some definitions refer to heterosexual sex acts. See