I was buzzed by some numb nuts on a crotch rocket a couple of days ago. Doesn't happen that often, but it startled me and made me pretty angry. He kept on going. I got over it.
For the most part, my interactions with the "bikers" have been pretty good. It's the two-wheeled thing.
With regard to Harley riders, car drivers, crotch-rocket riders etc., there are a few miscreants in any group you can name.