Is this a punishment? Did a vegan turn them down for prom and they swore eternal vengeance?
It wasn’t even an intentional fuck you but I worked at a pizza restaurant when I was a teenager that had sausage you had to pull apart and it would cling to your hands so people would dunk it into the pineapple or tomato tubs because the citric acid would prevent the stickiness.
As a vegan working a kitchen that does have vegan options, I am SUCH a hard ass about stuff like that. You shouldn’t cross contaminate food anyway.