I don't think that your son should be made to sit with the teacher, but then maybe your school should not allow peanut butter!
My daughters school is not peanut free, which is unfortunate and I've had a few near fatalities with classmates and their snacks!
My girls know to stay away from anyone with PB
I think kids should eat PB at home
If you were the mom of a child with PB allergies, then you'd feel the same way also!