I don't have a problem with that. If a girl tries out for the boys' teams, she is volunteering to play in a much tougher category, believing herself up to the challenge. So long as no one is forced to have X number of girls on a team for diversity, I'm fine with that.
When I was in a youth league baseball, way way back in the seventies, we had a girl play in the eleven and twelve year old division. There was no girls' version of the league. It was a Church league, not very competitive, but we had a lot of fun. She held her own. She was a little chubby (by seventies standards) and she swung a decent bat and was starting third baseman. My team mates made fun of her, but she was fine by me.
This idea of boys playing on the girls teams just so they can not suck as they would on the male teams will be the death of women's sports if we do not put a stop to it. Right now it's mediocre to loser guys who are doing it. But soon it will be guys almost good enough for the NBA, or just cut from it after one season, who will grow a ponytail, or get a weave and fill up the slots (no pun intended AT ALL) in the WNBA. The WNBA will be turned into farm teams for the NBA.
I can see women's weight lifting, what little women's American football there is, women's soccer, women's golf, women's tennis, and nearly all of the women's track and field sports being dominated by men with a claim of transgender identity.
Liberals, that is really what you want?