threaten them with a law suit.
Seriously that's probably your only choice right now
this
just this morning one of my classmates just nearly got forgeted over by our principal because he didn't stand up for the pledge of allegiance (which is an actual violation of his right), so the principal made him stand up or face somehing like detention, or at worst a slim chance of suspension. of course, not wanting punishment for doing nothing wrong, he stood up
my school pulls a lot of stuff like this and even have some censorship for what they do going on, I'll probably make a thread later on today when I get home