I do too, I live right by the lake with a bike path and these fuckers dressed in tights with sponsor logos (I know damn well aren't sponsoring them) irritate the piss out of me, they also ride right in the middle of the damn streets with bike paths 20 feet away and seem to be just looking for a fight.
I ride on a mountain bike too but when I have to use the roads, I get as close to the curb as possible so people can pass. I HATE it when they deliberately clog up traffic by driving next to the median