Seems that easy.

Sports have always been about fairness and not necessarily how everyone would want it framed according to gender, etc.

There's a reason there are weight classes in wrestling/boxing, multiple divisions in American football and other sports classed to the student population and reach of the school, etc. etc. It was always about having a level playing field as it does no one any good when a team/athlete just gets beaten down nonstop game after game.

Just say "this is up to the sports authority to decide and government should not be involved."

But, boys better in every way! Female inferior! /s ...kind of .... I mean, this is basically what these idiots are saying. No matter the age of the transition, an AMAB will ALWAYS be superior to an AFAB and they can't even conceive that it could possibly be otherwise (do you hear ANY outrage about trans men in sports?)

Before they bowed down to Trump I think the NCAA had a fair policy. If an athlete had not gone through puberty as a male then they were eligible for the female division. Of course the bans on puberty blockers quickly made that a moot policy.

I think this is the correct framing. Unfortunately the reality is that the trans sports issue is not a popular stance for the left. I don't believe in compromising our ethics for popularity but we can do the next best thing which is reframe the debate.

I think the new debate should be: explain why you think big government should be deciding how sports leagues decide eligibility? This is especially potent since it makes the right look like hypocrites for screeching about pointless regulations for years and then immediately endorsing some of the most unnecessary and hateful intrusions into our lives the second they gain power.