Take your money and run. (Just kidding but not really).
How do you cope after a performance goes sideways? I eat ice cream, cry, but then evaluate what could have gone better. Or I assess the situation (sometimes it’s not you but a client or booker who is cheap/hasn’t thought things through) and brainstorm on how to avoid that next time. Or I have a comeback up my character’s sleeve. I always say the only bad show is the show you don’t learn from.
What do you do after that happens to you?