I think he just likes to shout.  He kinda has to over his guests...  Personal story:  My mother was a liberal hippie lefty, and my stepfather is republican neo-con type.  They were actually really great togther, but always getting into political debates, and our home was often like an episode of the McLaughlin Group.  We called it the "I'm right, You're wrong Show."  "Issue Number One: I'm Right - You're Wrong."  LOL.

I assume they don't have the McLaughlin Group in Europe.  Here's a clip:

"Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.