Because it will quickly become obvious that males are generally stronger and faster and once the ladies - the real biological ladies - begin to lose every event, every time, they will be begging for the "fairness" of segregating men's from women's events.
Women are good at some things and men, others. There is no level playing field in the real world. The two, and only two, sexes are meant to be complimentary, not competitors.
I agree. Once this nonsense has reached its logical conclusion, in which girls and women are completely shut out by feminized boys and men, the pendulum will swing back in a major way.
Does this young man really feel proud that he beat out girls in a track meet? Does he put that girl’s trophy on his shelf with pride of accomplishment?