Though it can seem daunting, a range of noted thinkers from Karl Marx to Ice T agree that in such scenarios it is necessary to hold your friend to account for their misdeeds. Both for their own sake and for society writ large.
Transphobia cannot be separated from fascism because it relies on white supremacist principles to function. There are two genders, male and female, each serving a singular biological purpose: the continuation of the race. Anything outside of that binary logic is broken or degenerate. And while not all transphobes might agree that this race must be white, it’s generally white beauty standards that transphobes choose to call upon when trying to determine what a woman is.
The rules prohibiting high levels of testosterone in sports are still more likely to eject black cis women than anybody else, while the assumption that ‘real women’ will always be shorter, smaller, and less hirsute than ‘women who actually men’ leads to the unfair and unnecessary scrutiny of (usually queer, non-white and/or disabled) women’s bodies, sometimes to the point of even the most slightly gender non-conforming cis women being attacked.