My four year old cousin recently almost died from sticking his finger in a cake that had almonds in it. He didn't eat the cake, he just stuck his finger in the icing. So I'm sorry if your memory is a little foggy, but some food allergies are no joke. Still, if the kid does have such a serious allergy to peanuts, maybe he should eat in a seperate 'peanut butter free' zone instead of everyone else having to sit in a special section if they want to eat peanut butter.
If the child is at that much risk, why are the parents sending him to public school where instant death is possible?
Pardon me but something is amiss here. Any parent who would put that child in that kind of risk is not a very good parent.