I'm on the left, but honestly, don't give a rat's ass about girls in boys sports. I don't think many genuinely care.
The right is good at drumming up issues like this and elevating them to the most critical problems. There are plenty of LBGTQ people in the world - to each his/her own, whatever. Real issues are indeed immigration, the economy, and historically divisive issues like abortion.
But... bathrooms, sports, and 'cat' students wanting litter boxes in classrooms? Distractions to demonize. Silly.