The verdict is in (at least for me)!
Of the many years I've stomped around the US I've always tried to note things I liked about certain states, and things I hated about certain states.
I've come to the conclusion that California drivers are the biggest jerks on the planet. I say planet, because I doubt their complete disregard for road rules can be surpassed.
Prior to my last road trip I had the NJ/NY drivers rated as the biggest A$$holes.