He has a reputation in the comedy world. It ain't a good one.
Don't get me wrong, I love his stand up (perhaps it's something to do with me being from t'North- although I know some fellow Northerners can't stand him) but when he's a guest on anything, he comes across as loud and boorish. He has to take over and steal everyone else's thunder. He can't shut up and let other people speak, which suggests a degree of arrogance. His upstaging of others crosses the line from what I find funny to actually being irritating and even embarrassing.
Maybe he doesn't mean anything by it and isn't self-aware enough to realise it, being 'larger-than-life' and all but it can grate on the gears after a while.