Logically speaking,, I would get up tf up ran to the bathroom, bawl my eyes iut come out and act as nothing happened :> or you can just sit there and said sarcastic shit reply
Take a photo/video of them for yourself (several w/ captions of the situation may even be better). If you say something to them and they try to gaslight you or lie about you to others, you have proof of your own side. reply
I'd be ashamed of myself if I were to do that. Literally they're so inconsiderate. If they were to see this thread I hope they know how much of a shitty asshole they r reply