Ive gotten to the point where I ride them close until they get out of the way.
Regardless of how calm a person you are, most people do not like to look in the rear view and see the same fucking car right on them. Thats me. And, I don't get all on their ass to where I'd hit them if they braked, but I stay closer enuff to get on their nerves.
I also don't like it when semi trucks or rv's are in the fast lane. i don't care if they're keeping up with traffic, either - they shouldn't fucking be there.