I ride, but nothing pisses me off more than seeing two cyclists riding side by side down a pretty much one track lane (wide enough for 2 cars if they go onto the verge).
The reason most cyclists and motorcyclists get hit is not because car drivers don't look/pay attention, it's because they are complete and utter idiots who WANT to end up in some sort of accident. Or at least, given the way almost every cyclist and motorcyclist I've seen has acted, it seems like that must be the case.
A lot of the times when I piss off cars its because I'm anticipating the road ahead and how cars are going to react to it. For example there is a two lane road I go on frequently that is very busy. After a light, there is a steep hill and the road goes to one lane. There are bike arrows on the right side of the road.
When the road turns into one lane, the sidewalk curb curves in halfway up the uphill block. So the bike arrows on the right side of the road are given a curved path (there is not a lined path, just intermittent arrows). A key rule of cycling in traffic is to be predictable, so forcing bikes on a crooked path when cars are merging together is unsafe. A car trying to merge is going to find a bike being pushed into its right side by the crooked curb.
So I take the right lane as I approach the light, before the road goes to one lane. I do this because the middle of the right lane lines up straight with where the bike lane is 100 feet up the road, making my path straight. Instead of being forced into the road by the curb, I can make a controlled entry into the narrow road by taking the lane earlier.
This seems to piss off people who have to wait no more than a few seconds to pass me. I find a lot of motorist to be comically impatient. Sorry asshole I can't afford the $300 / month it costs to park downtown, so yes I am riding a bike to work so I can make a living. You having to slow down to 20mph is a consequence of us having chosen to liven in a crowded metropolitan area, get over it.