I never get testy with food service handlers. My hubby got testy with a worker at a Taco Bell here in town. I took my little girl and left him standing at the counter. He followed me and asked me why I was mad. I told him because there was no way I was going to eat at a place where the employees were angry at a customer.....they may spit in your food. Having a couple of hard shelled tacos and a steak gordita wasn't worth it.
I saw some news story (video) where a hidden camera has caught the chef blowing his nose on the food of some guy he didn't like. I've never forgotten it.
Heck, I'm a good cook anyway. Soon cherries will be in season so I'll make some Cherries Jubilee..