Regardless of what people think of him, I thought it was disgusting. If you can't make an argument or challenge someone with words and intelligence then don't resort to violence. Didn't think it was funny at all, although some of the responses on here are, but rather, just a dick head making an idiot of himself.
Apparently he dealt with it with some humor, after cleaning his face and shedding his jacket he said to the audience "OK, if there's any more pies can we please get them over with now before I start again"