i miss one of my old managers. he had a great way of dealing with people like that.
he’d walk up to the table, pick up the bill and smile politely at the table and say “we’ll be taking care of this for you. the exit is right this way, please do not come back”
When I lived in the State of Washington, we had a favorite Bistro owned by a hard working Lebanese. I’ve seen him chase a customer down the street, yelling, when the guy turned back the remains of a spinach salad (one leaf left) and demanded that it be removed from the bill, saying. “I forgot that I don’t like spinach!”
Another favorite ploy that angered him was when a customer would ask, “Could you please substitute smoked salmon for the rice pilaff?”
He’d say to my husband, “Smoked salmon is $2 a lb. Rice pilaff is a nickel. Does that ba—t-rd think I’m crazy?”