My first conversation was with Irfan Yusuf, author of Once Were Radicals: My Years as an Islamo-fascist. There was serious discussion and goodwill, but also laughter - lots of it. And much of it self-deprecatory.
To me, this was a wonderful example of Israeli writer Amos Oz's point: fundamentalists can't laugh at themselves. Taking the mickey, and having the mickey taken out of you, is a high point in tolerant, civilised life.
Importantly, this doesn't mean being cruel; doesn't mean wallowing in pettiness, mockery or sarcasm. Instead, it means taking your own ideas less seriously, and trying to (seriously) recognise the reality of others. First, goodwill. Then piss-taking.