He said the ridicule stops when violence begins. Drawing that line for everyone is impossible. People react differently to the same stimulus.
I agree that poking fun at repressive attitudes can help free people from the repression. It can help them recognize the absurdity of or even the harm done by repressive attitudes and beliefs.
The women I have spoken with from middle east came to the US to escape repression, including, but not limited to, the garb you see in the video. They talked of a very misogynistic culture where women lived in fear. Looking at the faces of some of the Muslim men in the video made me wonder how many women will be beaten for laughing at Teeuwen's jokes. The Muslim men in the audience certainly weren't laughing.
So ridicule, when done in an effort to end repression, can be a positive thing. But when it's done to repress people, I don't agree with it.
The women on the show used the term "insulting" when referring to Teeuwen's jokes. He defended himself without reservation. At one point I got the impression one of the women understood his motives. But all the while, especially after showing pissed off men in the audience, I was wondering if the women hosts were taking into account what would happen to them if they said what they really felt, like "Yeah, you're right! These are stupid clothes! And we are tired of men who think they own us! Ladies, time to protest! Let's burn our burqas!"
On another note, what's with the bed of nails/shrink couch they put Teeuwen on? That's a pretty bizarre place to put your "guest". Imagine Leno replacing his guest seating with these!