I know a couple with a child who has a severe peanut allergy. They request priority boarding on airplanes to get in first and wipe down the seat, in case anyone sitting in the seat prior was eating peanuts. The child also has a host of of other allergies, including diary and gluten as well, so they are super-vigilent about visiting other children’s homes, birthday parties, etc.... Parents carry an epipen at all times. I was around recently when the child had to be taken to the emergency room because she mistakenly ingested some dairy.
Interestingly, their view is that they would never request or expect to inconvenience anyone, especially an entire football stadium, for what is their family’s problem. They have developed a strict protocol of knowledge of their surroundings and food, and they manage to it. Others around them also are quite understanding - certainly when they visit, I make sure all peanuts are out of the house.
That is our family’s view as well. I hate even raising the issue unless I see a clear threat. Most of the others I know with allergic kids are the same way. This is why it is so frustrating when people say that parents are “just making it up” or “looking for attention” ... usually it is the exact opposite.