i worked as a prep cook and delivery guy at a pizza place when i first moved to estes park. we never used “hygiene retaliation” but the staff often wondered about the strategy of abusing food handlers.
one evening a couple got so abusive with the waitress that the owner came out and tok a polaroid of the couple. when he asked what that was for, the owner told him “i’m going to have this taped up by the register. if either of you ever come back i’m instructing the staff to call the police and have you arrested for trespassing. now, get up and get out and don’t ever come back.”