Then how the hell do you walk through life? You can't go to a mall because every mall has a Chinese restaurant cooking Kung Pow Chicken. You can't go to a Fair or a amusement park. Or a grocery store for that matter.
Nor do people who complain that their children must eat at a separate table because they brought peanut butter.
Put the kid with the allergy outside. Not the other 99.9%. No sympathy from me, either.
If anything goes wrong in your life, I certainly hope that your family and friends are more empathetic than you are.