GF+friends laugh at you

Your GF Sarah makes jokes about your tiny penis at a party, w/ her friends laughing. She insists the jokes are harmless fun, so stop being so serious. Your ex confirms how tiny you are, which makes everyone laugh harder. After the party, Sarah reassures you that no matter how small your penis is, she will always still love you. Sarah admits she will still be making those jokes though, cuz all her friends beg hearing them again each time they meet. Do you keep making a big deal over some silly fun jokes at a party...or do you feel like Sarah went too far?