"1) Are the Christian kids getting picked on because they are Christian, or are they proselytizing and being told to buzz off by kids that don't want to hear it....because those aren't the same thing."
Amen! But some Christians feel persecuted if they cannot have an unrestricted right to proselytize or tell gay people they're going to Hell.
If a student asks another student to stop preaching to them, and that other student continues, that's harassment and bullying. Period.