I think the issue is that
@PcDefender disparaged the eligibility of the boxer, but seems to have no method to determine in which gender the person should compete, other than having checking for descended testes. The object of his derision, apparently does not have descended testes and for all intents, presents with female genitalia.
So what is getting his knickers in a twist about? Is it just the usual trolling, or is there some yet to be seen critical thinking to his stance I wonder?
As Remery, D3 and FN and possibly others have noted, this is way more complex than a straight binary option. Bigoted trolling is unhelpful and harmful and perhaps that should be what draws the interest of the mods.