I support their cause, but they are paid with public money and it is well established that school boards can institute dress codes. It's up to the voters whether these are the dress codes they support. Turnover on the school board is the right way to fix this.

I agree that turning on the school board is right. I just didn't realize this was a thing in US. It seems like these dress codes can be considered pushing a political agenda with public money too, but I don't live in US.