It would have to be something blatently horrible for me to send anything back. I would just push it aside. One bite of horrible would be enough to rob me of any appitite for any food. I wasn't happy about the cricket in the mushroom sauce, and esp. not happy about being told by the waiter not to fuss. We paid of course, but I told everyone on the stairs (it was a busy night) to watch for crickets, and the people waiting at the bar too. And everyone at the childrens private schools, and in the (very large) church, the people in the shops I visited, everybody I came in contact with. Which was lots and lots.
All the waiter had to do was take the napkin, with cricket entombed, away. He didn't, he told me not to fuss. So I sent the poor cricket to the Health Dept. None of that need have happened. It wasn't the **** cricket, it was being told not to fuss. The cheeky brat. It was a joke around our city for quite a time. "Steak and Mushrooms, please, I will pass on the crickets". "Does the soup have blended crickets?" It must have been very hard for the good wait staff, and sent steam from the chefs ears. Unfair? Perhaps. The kitchen in Mission Bay or Mt Eden, was not responsible for the stuff ups in xxxxxx area.
I don't mind gauche service, hesitant uninformed service, even having stuff dropped on me. It can all be navigated by good will, good manners, and quietly. BUT !!! DON'T, EVER, tell me NOT TO FUSS. And all for a cricket.