Depends on the claims being made.

For the most part, if a person wants to play a sport with other people... why does it matter? Is it a shower thing? Well, get some dividers up. I guarantee you that I don't feel comfortable being around other naked people (except for my spouse). Is it a changing room thing? Well fuck, throw up some more dividers if somebody wants/needs privacy. Using the toilet? Once again, single occupancy stalls, privacy dividers next to urinals, and designing the bathroom so that its more difficult to watch other people pee/poop.

Is it the stupid "bone density thing" that Rogan spouts? Fuck that nonsense, ask them about which sports divide up cis participants by their bone density. Whats that? Its fucking zero? Of course it fucking is. Sports tend to be divided up by things like "Team Wins/Losses", "Height/Weight", "Who has the most fucking money".

In all the sports where transgender/intersex athletes are ALREADY playing, what do we find? Are they dominating the sport? Nope. Of those that do "win", are they winning by so much that no cis gender competitor could hope to catch up? Nope.

Fuck... how many transgender people are even trying to get into sports right now? Not that fucking many I tell you what. And if a team is worried about an opposing team having a transgender athlete, and that somehow them being transgender is a huge advantage, you know what the answer to that fucking problem is? That team goes out and recruits their own transgender player to balance the teams.