There is no rational argument related to ‘equity’ in sports. While I believe it applies to non-professional sports as well, using professional that are male dominated, e.g., NFL, MLB, NBA, NHL, and probably all others, as the standard, they DO NOT PROHIBIT FEMALES from playing. There have been the odd tiny handful of women that managed to make it onto professional teams, but I can’t think of the names of any of them, and I don’t know of any that made any significant contribution to their teams, or those sports. Women are simply not physically equipped to compete with men in athletic sports that require size, strength, speed, agility, and stamina.
That being the case, there are “women’s” sports, so they can have a level playing field to put their skills on show. To allow biological males to participate in those women’s sports un-levels the playing field, and robs the women of their ability have their best performances be recognized as excellence in their arenas.
And that’s just wrong, on all accounts.