Is that like people who say pineapple should never go on pizza? I’ve seen people who have said they broke up with their otherwise perfect partner because of how they liked their steak. Not because of how they cooked a steak for others, but how they preferred their steak for themselves. Madness.

For me it spans a range of behavior. One is fury over adding "non-traditional" things to dishes. Another is insulting a dish because it's not "authentic" ("how REAL [insert ethnicity here] make it.") Basically any rage over how someone else prepares or enjoys their own food.

I don’t like salmon, but every time I grill I throw some salmon on there, because my wife does. I don’t drink, but I frequently buy wine. I hate oysters, but I buy them when the place has a deal on them on Fridays, because why should my preferences mean that other people don’t get what they want?