Fast? Yes. Rude? I'd disagree. They generally are knowledgeable of the rules of the road, let people in when appropriate and are generally not "rude." Cutting in front of someone while you're going fast and have enough room to do so might scare them if they're a bad driver, but it's not rude.
My troll answer is Wisconsin for having so many inconsiderate drivers who drive hilariously slow and, by extension, put the traffic around them in danger. My serious answer, from my experiences, is easily Florida.
I live right on the MO-IL border and a common complaint I hear from Illinois drivers is, "Don't you Missouri people know how to use your blinkers?"
When I'm driving in Southern Illinois, I've noticed most of the drivers drive the speed limit because I pass so many of them and I know I'm speeding. I got one of my two speeding tickets in Illinois.
