That's what I said last night. He was using the same boardroom tactics which he employed while in The Apprentice. It didn't feel like he was having a natural conversation, it felt like he was using the same debating methods he would use in Alan Sugar's boardroom.
He wanted to have his say, but he only wanted to have a one-way conversation where when the other person spoke he decided that he wouldn't allow them to have their say to him like they allowed him, and conveniently decided that was the time when he didn't want to talk about it anymore.
But then on various occasions he did talk about it again, but in the same selective manner he did before, by having his say and then saying he doesn't want to talk about it anymore if the other person made a good point.