I disagree on the "have to ridicule, malign and be derisive about it" part. I think in school, or any place for that matter, that threats should be not allowed in any form. They can share, but if a student feels threatened, tells them to stop, and they continue, then it's harassment. They do not HAVE to ridicule, malign or be derisive about it and there should be consequences for those who do.
Has this been your experience of school? That you can expect rational discourse with the prejudiced? I'm a believer in accepting diversity, bullies come from all sides of the equation. In a school the atmosphere should be to develop thinking skills, not teach that everything can be solved by punishment.
Actually, in highschool (and it was a public highschool, if anything, it was "liberal", not in any way religious) I had a classmate, a Catholic who was heavy on proselytizing the whole class.
She (yes, it was a she) would pick out some people and preach to them, including myself. Before class, sometimes during class (especially when we discussed literary works, which provided ample opportunity for contentious issues), and right after class. She'd go right after the person, wouldn't let go. I sometimes ended up in tears.
She wasn't so much into the whole fire and brimstone thing, but somehow, she was extremely manipulative, extremely slick. She'd pounce in on heavy issues like death penalty, abortion, politics, morality, justice. She was somehow able to twist around everything one would say, and so quickly, and with that poisonous emotion. She wasn't directly rude, derisive or dismissive.
There is of course the factor of one's own insecurity about big issues of philosophy and morality.
Moreover, when you're in highschool, you don't want to embarrass yourself in front of the other students, and you feel you need to intelligently rise to the challenge.
Sometimes, she'd challenge someone and some of the others cheered on (even if they weren't Christians).
The pressure was intense.
I do not recall though that anyone would ever mention this to the teachers.