Will Smith Slap copypastas

AITA for slapping a stand-up comedian who dissed my wife? Okay, little background. My (53M) wife (50F) has a medical condition called Alopeca Areata, which basically means she has excessive hair loss, and is currently bald. My relationship with my wife wasn't stable over the years, and I've caught her cheating on me multiple times, but we've pulled through. Anyway, we went to an awards show and usually there is a comedian who hosts the show and makes jokes at everybody (in a good way). The comedian was a guy we know (and he knew us), and we had a really good time. At one point, he mentioned me and my wife and I was happy he acknowledged us. But then, he took a jab at my wife about her condition, which I thought was way out of line, but I laughed out of embarrassment. My wife, on the other hand, was not laughing at all and rolled her eyes. At that moment I knew I had to stand up for her. I got up on stage, smacked the sh*t out of the guy, and went back to my seat. The comedian was shocked and really wasn't expecting my reaction. He wanted to keep talking about my wife but I shouted at him to stop. Usually I don't curse, but I was really pissed about the whole situation. My friends could see I was upset and during the break they came to comfort me, but other people think I'm the asshole. What do you think?

Jada: Are you going to let him speak about me like that? Will: What, it was funny, you were terrible in G.I. Jane J: I wasn't in G.I. Jane, Will W: Oh, then why did he say that? J: It was a joke about my hair!! W: Girl, you ain't got no hair J: THATS THE POINT WILL!! W: Ohh. ohhhh. OH Hell No!!