> In fact, several states will soon require displaying the 10 commandments in public school classrooms, which seems pretty “right-ish” to me.

That tells you way more about the (current) politics of the local government than it does about the politics of the median teacher. It might actually indicate the opposite - no one would go to the effort of mandating pride flags at the school I went to, seeing as they were already hung in every single classroom.

Why would hanging pride flags in every room be comparable to showing the ten commandments in every room? A poster of the commandments is promoting religion in a secular school, and the flag promotes human rights for queer people. Why would a pride flag be controversial to anyone who isn’t a religious zealot?