People who drive Ford Taruses. 99% of the people who drive them around here are TERRIBLE drivers. My favorite is the girl that was tailgating me while driving with her knees because she was putting her hair up in a ponytail.
People who drive 50 foot long RVs and THEN tow a car behind it. Look, if you're going to truck around in one of those things, then you should just have to pay the consequences and drive it EVERYWHERE.
People who tailgate and just get closer to me when I pump my break to tell them to back off. Hello, if you can see the hair on the back of my neck, you're too damn close!
Mississippi drivers. I used to live about 10 min from the state line. They'd come to my town to cause accidents all the time. Pretty much everyone I know that's been hit in that town has been hit by a MS driver. I think a requirement for getting a license there is FAILING the driver's test. And not having a full set of teeth. Or insurance.