Christian schools have every right to hold students and faculty to Biblical standards of conduct. That's why they're in business. I'm sure that if a student came to a Christian school and recruited for Stormfront, they'd be expelled, and that's within the perogative of a Christian school. This school will not allow for homosexual behavior or advocacy of same. That's their perogative.
The legality of gay marriage may well be a settled issue for my lifetime, as the legality of abortion appears to be. The acceptability and moral correctness of those issues is most certainly not settled, however. At least not on Earth. These issues ARE most certainly settled in Heaven, however, and certainly not in the manner of Supreme Court rulings.
I'm not going to say that the Bible condones homosexual activity. Because it doesn't. Scripture says what it says, and if I'm dissonance in the Echo Chamber, so be it.
... Please tell me someone else is going to say something about the comparison of homosexuality to white nationalism.