There's a word that used to get thrown around a lot in this thread I haven't seen lately when analyzing Bob's thinking (if one can call it that): Manicheanism. Bob is pure black and white, to a fanatical degree. If he approves of something, it's the Best Thing Evar, whether that be Obama's presidency, Hillary's candidacy, or the artistic greatness of cartoon comic book movies. If he doesn't approve of something, it's vile plague, slope browed idiocy, absolutely not to be considered or engaged with. Highfalutin language aside, Bob is a simpleton who cannot appreciate nuance and is incapable of considering another's point of view fairly or honestly.
I think people keep putting that forward as evidence of autism, which I can't speak for one way or another. But whatever it is, something is obviously broken in Bob's brain, and whatever the reason he's forever engaged in splitting behavior, whether it's about politics, movies, video games, or where you happen to live in this country.