//Her allergy so severe that she can react to peanut dust from 10 rows away yet they risk taking her on a plane?//
Difficult one really. The parents are responsible but she would have no life if they wrapped her in cotton wool and allowed her to go nowhere. I tend to think of it the way I would think about anyone who has a disability. As I would give up my roomy seat to someone who, because of an ailment, needs it more, so I would refrain from eating or using something - a perfume spray for example - that is likely to make someone ill. I wouldn't jail the man, but I don’t think it was too much to expect him to comply with a polite request - and one made for a very good reason. I've got to say I don't like him much - even though I don't know him.