I don't think anyone is disputing that these may be irritants to you. I can certainly sympatise with you. But being someone that is so hyper-sensitive to allergens, how do you walk from the parking lot with the emitions?
Never met one that had refused. And yes, I have asked someone to refrain from doing so.
No, I just find it to be a non issue. As I have said, yes, I think that it should not be allowed in que lines and such, but I do not see any logical reason to restrict it in the open.