If they were do you think you could make them stop without a fight on your hands ?
I'm not sure.
If Jews "flying the Star of David on Sinko Day Mayo," did not cause a disruptive environment in the school, I wouldn't care.
But if it did, I'd warn them, then if they refused, I'd discipline them on the basis of their defiance of School Administration.
The safety of students is the priority of school administration, and student's individual rights of expression come in at a distant (second? third? forth?).
The JADL would be all over your ass like stink on shit in less than an hour
heh.....yes, being a High School Principal is nothing if not a thankless task.
This is why documenting everything is essential in today's public school system. But, if schools weren't doing paperwork, for what else would the public be paying?