The Labour party representatives have been getting a lot of stick recently. It's the nature of the format, it allows for bullying and when one of those people is a racist, holocaust denying fool who is intellectually incapable of matching the rest of the panel (especially Bonnie Greer) it was going to be carnage.
The audience should possibly have been stopped from making some of the more emotive statements and David Dimbleby could have tried to be more impartial, but you can hardly fault him when a person who goes against everything he believes in is sitting next to him like he has earned the right to be there.

I'll just quote what Bonnie said "I spent the entire night with my back turned to him. At one point, I had to restrain myself from slapping him. But it was worth it because he was totally trounced".