I'm actually not surprised to hear this. I don't have personal experience of his attitude, but every time I have seen him on television I've thought that he doesn't really look like a nice person. I mean he seems to put himself forward as a down to earth, all round funny guy, but he just sounds a tad vicious to me. Unlike Michael McIntyre who comes over as a really nice guy in person.
Thought most comedians didn't like McIntyre?