I would just say (if I was a guy of course) that 'it's not small, it just looks like it compared to your giant vagina'
^^ to a girl or guy that one is hilarious!
and are some of you seriously encouraging him to start shit over this... ? i kinda thought he was looking for a funny comeback, not a fight. you gotta be better than that. if you're really going to fight smeone for this it will just make you out to be the asshole who is sensitive about his tiny penis