Hey  M4    What restaurant does he work at?  I have a good reason for asking. I may have met this bozo

I see a couple of solutions/responses for future occurences:

1) "Whatever man (laugh out loud), grow up."
this one acts to just piss him off and make you look like the bigger man.

2) "You are what you eat, dickhead."

3) Make his gf think he's cheating on another girl, or better yet, a man.

And my personal choice. . .

4) Get in a fight with him, take every punch adding "Yeah, this pu$#y wants it harder. . . is that the best you got?" with each hit while laughing hysterically. When you get all bloody, go to the police and file on his ass. You'll be beaten up and he'll have the bruises on his hands to prove it was him. Tell the police he was trying to get you to draw down on him and you refused to even fight him.  

Edited to add that if all goes well, you can drive his gf to visit him in prison and ask him what it really feeels like to be a pussy or at least be used as one.