i don't know your specific situation or the individuals involved, but in a general sense, if your dad is openly criticizing your appearance in front of other people, especially if he's trying to make strangers participate, that's a pretty big red flag for abusive behavior. it's controlling and manipulative and it's not okay because it's a deliberate attempt to make you feel insecure about yourself to give him leverage over your personal decisions. hopefully this will be an opportunity for him to see that isn't okay, just hope for the best i guess. he probably doesn't want to give up seeing you either and maybe he wants it enough to change