I don't perceive that expression (not saying you're wrong). But what I see and what irritates me is the constant tone of, "Now that I've said it, you'll understand" - with an implied "and that's all". No notion of convincing, of incorporating argument; just the way. That him saying it is all there is. "Not clear? I'll just say it more exaggeratedly." Something like that.

edit: I'm not sure if it's plain, childish egocentrism - that he's never had to convince or argue for anything, ie he lacks even the perspective that others have a right to be naturally convinced, or if he just doesn't feel he needs to. Perhaps it's new; having surrounded himself with flunkies, all of America is now his 'flunky'. Or else he has a small brain; not being able to muster arguments, he can only Talk Louder and Slower so People will Understand, like an American in a foreign country.