The issue is flying over your head.  We have boys and girls teams for a reason .  Your example of just one girl who was better than everyone is a fluke . It's hardly being rigid expecting boys and girls to play on the correct teams.   What if a six foot ten boy decides he want's to play basketball on the girls teams ?  He'd smoke the girls and make games unbalanced and most of all unfair.  If a person doesn't make their team because they aren't good enough--that's fair enough .They have other sports for them to participate in . But for a girl to be told she's not on the girls team because a guy pretending to be a girl took her spot is an outrage.  In Anchorage some years back there was a really good female hockey player who tried out and barely made a weak  boys high school hockey team .  Girls hockey doesn't allow checking . When the girl was on the ice the boys had to back off and not check her . She wasn't good compared to the boys .  It was sad to watch .