You clearly haven’t stepped in a high school post-COVID.
But I'm skeptical this is an issue. In the same way that Joe Rogan and conservative media decided to start saying schools letting children use litter boxes in school was a big problem, which was also not true.
How many high schoolers currently identify as LGBTQ? About 25%.
Odds that at least one of your competitors in gym looks like a biological male? Very high.
How does that make you feel? Angry that this could even be possible.
(There's also the issue that many people disagree on principle - in other words, any number greater than 0, is an absurdity. It does not matter how low it is, and I have to agree with at least the ideological consistency of that position.)