Let them yell. If they gave you such bad service that it comes to that, it's not like you'll be coming back to that restaurant anyway. I have refused to tip a

Let them yell. If they gave you such bad service that it comes to that, it's not like you'll be coming back to that restaurant anyway. I have refused to tip a handful of times and not once have I had any desire to return to those restaurants. They could burn down for all I care.