Generally, restaurant workers are proud of their food and work hard to make it a pleasant experience (so they can get good tips). But if you abuse the waitstaff, all bets are off!
A guy I once worked for was a lousy tipper but he fancied himself as some kind of gourmet. Anyway, every single time we had dinner or lunch with him there was some kind of problem. They got his order wrong or soup was spilled or something worse. I suspect the staff had his picture posted in the kitchen.