It looked like this occured at Mencina's show, which makes it even funnier. The entire crowd turned on him 
" had a set at the comedy store Saturday night, and after I closed, I was bringing on the next comedian, a guy named Kirk Fox that works for Carlos Mencia.
I introduce him saying that he’s a funny guy, and that he opens on the road for Carlos “Menstealia.” That’s the name we call him at the comedy store, and of course Carlos doesn’t like it one bit.
Carlos was apparently in the room when I said this, and the perfect combination of ego and timing made him decide that this was the night to put his foot down.
As I got off stage and headed towards the back of the room, he grabbed the mike away from Kirk, and said that I was too much of a pussy to say that shit to his face.
Which to me, is something akin to the hottest girl in the world daring you to fuck her while you’re standing there in her bedroom naked with a boner.
Of course I had to disagree with him, and I decided to get onstage with him and have this “meeting of the minds” as it were."