My childhood friend has the peanut allergy, and all I can tell you is go and be that pushy overprotective, intrudingly obnoxious parent who gets to know every ingredient in school cafeterias and demands peanuts be taken out of the school menu.
The memories of the two times, several years apart, that he had an allergic reaction right in front of me, are scarred into my memory. The first time he almost died because his mother hadn't added the peanut allergy to his medical sheet yet that year, it was the first day of school, and the nurse didn't know what was wrong with him. Stay on top of it, inform everyone you know.
My son is also allergic to peanuts.
I would never demand that peanuts be taken out of the school menu--I would pack the child's lunch and snacks each and every day and be sure he/she has an Epi pen handy. What's wrong with this person, too lazy to pack a lunch?
People who seek to change things to benefit their own extremely small minority are positively despicable. Think Michael Newdow.