I think it would be more effective for parents of girls to raise hell with school officials who institute policies take away girls’ privacy and sense of safety. There is a lot of talk, mostly BS, about “safe spaces” nowadays. I think a girls’ bathroom and locker room should be a “safe space” for girls.
It’s going to take some lawsuits where the parents are able to bankrupt schools for failing to protect their children before the schools are forced to back down from this stuff.