[Rorkimaru]

I'm not defending any of Marc's past behaviour here, I'm just talking about the argument that caused Brian to leave.

Mark was one of the first to try and calm Helen down and to object when she said rapist and murderer. Prior to that anything Marc said during to argument was at most on par with what Brian and Nikki were saying. He seemed genuinely and IMO fairly surprised when they said his behaviour was wholly inappropriate. It does seem like they were reaching with the example of him saying psycho. It's not a nice thing to say but Brian wasn't exactly being nice either.