I can't believe I'm getting into a position of defending this guy, but I'm wondering about editing making things look quite different from the way they are. For example, people are always saying, just tell me if I'm going, don't do it behind my back. Maybe he is one of those types and is doing unto others what he'd like done to himself (even tho it is very bad strategy, gives them a chance to rally support). So that would account for his behavior at the lunch and with Brandon.
And the "no room at the inn" remark might have been a joke? After all there used to be more people on the tribes so more people used to sleep "inside". There can't literally have not been enough room.
But, on the other hand, JoJoDea, some people behave very differently with peers or superiors than with underlings, as tickerrose said...if you want to know what someone is really like watch how they treat the secretaries, etc. when they are the boss. Or the waiters at a restaurant. So you may not have seen that side of him. Yet.
And on the third hand, some people just get a little nuts over the team thing. For example, Mark on Biggest Loser, when they pitted the men against the women, was calling the women scumbags and comparing them to the criminals he worked with every day (he's a cop)--but when they switched up the teams and he was paired with the woman he most disliked he bonded with her. So my point about Jamie is, he may just be into the trashtalking team loyalty thing--what he thinks is "normal" behavior.