I stopped going to tourneys in MK9 because I pretty knew I had no chance with all the Cyrax's, Kabal's, Smoke's, Cages, Kitana's, Sonya's, ect. I'd rather have kidney stones than grind out the Scorp vs. Cyrax mu for years to come.
I think with the whole waitress thing that person should just go about his business like it never happened. He pretty much already rejected her and she knows it. She probably just wants to forget it so just not even going through the confrontation is the way to go imo. If she really wants to put pressure on the situation she'll mention it again, which at least at that point makes it more her fault than his.