That thread has become more than that. Somehow, the topic got over to allergies, and a guy said he brings his own can of peanuts on a plane and eats them when they don't serve them because of an allergy.
Then he tried to say that people aren't actually allergic to the smell of peanuts or the dust. When I told him we, no, that's not the case, I have a peanut allergy and I know from experience that it's not the case. He then asked me why I don't just treat my own allergy instead of "inconveniencing" everyone. Then he proceeded to explain my own allergy to me. Good grief, mansplaining at its finest. He got two very sarcastic responses from me in return.