Unfortunately, this is a subject I think about quite often...when I'm riding. I find myself upset at cars quite often. Yesterday, I was going around a large pot hole and a car approached and beeped and yelled at me to "get out of the road". I hadn't moved in front of them, they just thought I didn't belong there. I often almost get hit, I get cut off, I have things thrown at me, etc. All of these things really make me angry at drivers: I mean really angry! I spend too many rides fuming over these drivers. This does at times lead to some pretty fast "angry rides", but I'm not sure it is worth the extra speed.
Two days ago I was going to a group ride that started at a bike shop. When I pulled into the parking lot, there was one open space with several riders standing in front of it talking. I politely pulled up to the space and signaled that I wanted to park there. The riders continued talking and showed little interest in moving. I inched up and they very slowly moved a couple inches out of the way. I squeezed into the space and they didn't so much as acknowledge me as I pulled in. When I ride with this same group we are usually prepped with a talk about being polite and respecting the rules of the road and the busy traffic. Nevertheless, some of the riders habitually run red lights and show no regard for traffic. I've seen some of these riders riding four abreast and when other riders called "car back" over and over the other riders didn't even look. I can only imagine that this infuriates the drivers. God knows my father always complains about "kids on bikes in Cambridge".
So who is the culprit in this feud? Who "drew first blood"? Well, I suspect both sides feed off of each other's insults and past transgressions. However, if I had to point my finger I'd point it at a lack of education. Bike riders don't always know the rules of the road, and driver's know even less. After all, if you think the bike belongs on the sidewalk, you're certainly going to get testy when one has the audacity to ride on the road.