Earlier quoted context omitted.
Civil rights are not a zero-sum game. One group of people gaining rights doesn't take away the rights from another group, but that is commonly used as an argument to manipulate people into opposing the expansion of rights without confronting what that opposition really means. We saw it with integration in the US often presented as an infringement on the rights of white people. We saw it with gay marriage when people…
Sometimes they aren't zero-sum. For example, trans-identifying people being protected from employment discrimination. This takes nothing away from anyone else, but makes this group's lives easier. But sometimes they are zero-sum. The right of women and girls to have female-only spaces, for example. If a subset of males are given the right to use such spaces, they cease to be female-only spaces. By doing so, this righ…
How is this different from a white person wanting a "whites only space"? Because you are seemingly arguing for a right to segregation. I think we are better off reconsidering the root desire and how that should manifest itself in a concrete right.
For example, what right do you think the children have in youth sports?
Do they have a right to win?
Do they have a right to be on a team?
Do they have a right to compete?
Do they have the right to compete against someone with equal talent?
Should it be allowed to force a younger kid to compete against older kids?
What about a short kid against tall kids?
Should a Muslim fasting for Ramadan have to compete against Christians with no dietary restrictions?
Can a white child complain about having to compete against black children?
What if only one girl wants to play a specific sport, is it legal to force her to compete on the boys team? What if all the boys are better than her?
I just don't know how you answer these questions consistently and end up in a place in which trans athletes are your only fairness concern.