What to do when your girlfriend purposely hurts you to show off?

My girlfriend thought it was funny to randomly mock my small (I’m 3inch erect) in front of her friends and family and they all laughed. I responded by saying she had a manly chest, a backside resembling an ironing board and a fruit punch bowl for a . I continued insulting her until she started crying and told her that I’ve seen men with more back off then her and she started crying and she won’t speak to me. Her friends even had the nerve to gang up on me and try to force me to apologise since her self esteem has sunk deep. I know she was wrong but did I go overboard with my insults because she really got on my nerves mocking my . I kind of feel bad because she is extremely depressed but she shouldn’t mock my manhood like that and know I don’t know what to do. Should I try speaking to her or giving her some space?