You've never worked in a kitchen, or food services in general, have you?
Angry servers waiting for an excuse to fuck up a rude-ass or infamous customer? Yes. Opportunity to take something disgusting and put it in/on food by people from the cooking line to the serving staff? Yes. Drugs in the kitchen? FUCK yes. Common poisons for rats and insects in a restaurant? absolutely!
People in a community who have been embarassed by a local shitshow for years now completely humiliated that their community is now a laughingstock for housing a literal motherfucker, who work in food services? What do you think?
To be fair, that piss/cum/spit thing is a meme. I'm sure it does happen, but even the vilest, coked-up, aggressive freaks in the kitchen would probably rat out someone who did that kind of stuff. It was joked about a lot, though. Most of the real revenge things were just deliberately messing it up in small and plausibly deniable ways so you could pretend you had no idea what they were complaining about later.
Bring them the main course after they complained about the appetizer and then bring the appetizer in the middle of them eating the main course. "But you asked for it this way."
I always thought the best job was washing dishes especially with one of those awesome commercial dishwashers with a dozen specialized sprayer things that could high pressure blast anything clean (except for the cheese from French onion soup and scrubbing that shit was the only bad part of the job).
Another good thing about the dishwasher is it generated a lot of white noise and calming steam, which sort of drowned out the eleven millionth replaying of Bat Out of Hell.
Your final part rings true. People who work in service in this small town talk to each other. He's been banned from fucking everything at some point, and his whore of a mom who he raped has too. Any people working customer-facing positions has either been personally molested by this asshole and had to ban his ass or knows someone who has. He has routinely tarded out without penalty and abused these people.
So yes, I think this is one of the cases where the meme might be true.
I think it's generally an insult, though, to suggest that food service people routinely fuck with people's food, at least in the biological contamination way. The more of a dick you are, though, the frequency with which your orders are filled with odd "errors" increases logarithmically.
Don't blame service personnel, though, usually. Most of the current errors are massive understaffing and just from the people who do choose to work being absolutely frazzled and overworked.
