What a fascinating field study of the malevolent it would be; though I suspect they would be utterly boring in their ordinariness.
I wish I could follow these people around with cameras all day long. I want to know everything about them. I want to know what they do every day, how they talk to each other, how they spend their free time, where they vacation. I want to know what kinds of human beings are comfortable behaving this monstrously. Do they look like monsters? It’s hard not to picture them as monsters.
Ask Polly: My In-Laws Are Careless About My Deadly Food Allergy!
Because weird, antisocial behavior is interesting to me I poked around and found a whole Allergic Living piece from 2010 with anecdotes of relatives sneak feeding allergens.
Affirming group membership by eating the same thing must be deep in humans.