In SF, folks on bikes harass folks in cars.
http://www.latimes.com/news/local/la-me-criticalmass12aug12,1,7129852.story?coll=la-headlines-california

Frankly, the folks on bikes need to understand that stopping a car is a life threat
and I will drive over their bodies. Doesn't matter if they're whites, browns, or blacks,
they are road kill if they try to contain me or my son in our car.

Its that simple