These a$$holes make it less safe for the rest of us cyclists who make an effort to share the road. Pride can be a dangerous thing.
Up until I hurt my ankle, I liked to mountain bike in the hills. If it was a pretty day, I got the road bike out and rode the neighborhood. I never had any issues with people. I always got over to let them pass. They always tooted and waved as they went by me, and I waved back.
My problem is with the cyclists and especially the road bike cyclists.
I passed one on a hill once. There were no other vehicles and he was riding almost on the center line. I moved over to the other lane to go around him slowly. He still flipped me off!
Mountain bikers seem to be much better than some of the road bikers.