Being blunt:
Most of the time, no one really cares about high school girls' sports except for the parents and friends of the players. For most people, when they see "Local High School Girls' Soccer Team Wins State Championship" in the local newspaper, they'll yawn, not even offering a "good for them," and eagerly await the start of football or basketball season, whatever makes the local high school the most money.
Those same people who yawn over high school girl's sports, however, will fly into an apoplectic fit when a trans teenager is introduced to the team, crying how it's not fair to the other girls, how the trans teenager is inevitably bigger, stronger, and has more facial hair, and how their precious child was cheated from a spot on the team. They'll go to internet comment sections, the district Board of Education, the local City Council, to their dog, they'll whine to anyone who will listen. It's not really about protecting women's sports, it's whining about how the world is changing into something they don't like, and how this is all Very Unfair.
But instead of perpetually taking it out on my community, I wish they'd take their iPhone, go sit in their first gen Prius, record and upload a 60 minute video to their social media pages whining about how life is unfair.
I've seen jerks who whine about trans women competing in sports before. But more and more trans women are competing, and it's becoming the norm. And I have a smile stretched from ear to ear knowing that all the whining and kvetching over this couldn't stop it.