In one of its final decisions of the 2025-26 term, the Supreme Court of the United States solidified its place in the onslaught of eradicating trans rights, in a ruling that revolved largely around whether state bans of transgender athletes violated Title IX and the Equal Protection clause of the 14th Amendment.

In response to the question placed before the court of whether states could implement bans on transgender athlete participation in girls’ and women’s sports, 6 of the 9 justices said, “Yes.”

Outside of patchy citations and contradicting interpretations of legal precedents, the rationale behind the majority opinion of the court, written by Justice Brett Kavanaugh, echoed three key premises in the “sports context.” First, female bodies are inherently physiologically different from male bodies, which map onto sex-based athletic advantages for males. Second, regardless of these differences, girls and women should have equal opportunities to boys and men. And third, because of these differences and because of equal guarantees between the sexes, “competitive fairness” and “safety” look different for the female category as compared with the male category. Consequently, the only way to ensure equal sporting opportunities for girls and women is to keep transgender girls and women, or “biological males,” out of the female category.

Anti-transgender advocates in the broader “save women’s sports” movement frequently draw from these rationales, but also ignore the underlying deeply problematic and troubling considerations. On an ethical level, this approach undermines inclusive efforts and further stigmatizes transgender individuals. On a public health level, this reasoning deprives an exceptionally vulnerable population from enjoying the social, mental, and physical benefits from physical activity that should be enjoyed by all. And on a pragmatic level, these declarations overlook the minimal number of out transgender youth, of which even fewer participate in high school level sports.

Notably, of all the documented issues in and across women’s sports, there is no evidence demonstrating that transgender athletes, in any way, contribute to these inequalities.

Beyond parroting this tired transphobic logic, the majority opinion also points to other sports governing bodies, such as the National Collegiate Athletic Association (NCAA) and the US Olympic and Paralympic Committee, who have “drawn a biological line” to ensure safe and fair competition by banning transgender athletes. What Justice Kavanaugh omits, however, is that both organizations abruptly changed their policies following President Donald Trump’s Executive Order No. 14201, rather than in response to any scientific evidence or domination of transgender athletes (in response to a Senate hearing question about how many transgender athletes compete in the NCAA, NCAA President Charlie Baker infamously responded that of the more than 500,000 athletes competing, he knew of “only 10”).

While this ruling itself does not necessarily come as a surprise to those who have followed along with the US’ steady rollback of transgender rights, perhaps the most shocking element of the SCOTUS’ majority opinion is the brazen use of transphobic and misogynistic language in their ruling. “Biological males” and “biological females,” which are used 64 and 31 times respectively in Justice Kavanaugh’s 29-page majority opinion, are not rooted in medical terminology. Instead, these are terms that have become popularized and mobilized by anti-transgender advocates to reinforce a binary model of sex difference. This type of sex segregation is premised on patriarchal beliefs of male athletic superiority and female athletic inferiority, and has historically led to harmful body policing, racial discrimination, and erasure of intersex persons.

There is also reference to an “ongoing medical and scientific debate” surrounding whether transgender athletes maintain athletic and performative advantages after transitioning. What is absent from this brief........

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