The dude who runs Shelby's makes funny tok tok shorts about ketchup on shawarma. He even has a set of recurring characters and includes customers in his sketches sometimes. This is an elaborate inside joke.
I don't get people who are bothered by others eating things how they want, but idk if my personal peeve puts me in the food purist category or a language prescrivist (I'm usually the opposite of it). I think food items should be called what they're and names should not be interchanged because the idea seems similar, like a crunchwrap isn't a calzone (the comparison I could recall from the top of my head)