Serves her right
The OP was waiting on a man and woman, the latter who was clearly not having a good time. The guy was being polite enough, trying to engage in small talk and so on, but the woman didn’t want anything to do with it. She never once took her nose out of her phone unless it was to complain about whatever minor inconvenience there was.
After the woman unnecessarily complained about how she didn’t want her jacket stolen by the coat checker, the dude finally blew up. He said that was the worst date he ever had and promptly left the restaurant. The OP was manning the doors that day and let the man leave. The woman was stuck with the bill. Ha!