This is What They Think of You; Prove Them Wrong
I'm not part of the Tea Party. But the video posted by Bob Ellis at Dakota Voice certainly shows why it has some traction.
When you write people off and dehumanize them, they will at some point organize against you. It might be active or passive aggression, but they will resist. Folks on the left are good at seeing this in the experiences of various minorities or disenfranchised groups; they're just not able to see the way in which they play into the same scenario.
I mean, really. "You disagree with me so you must have a neurological problem." A monstrous thought worthy of the worst totalitarians.