However, a lot of cyclist do do infuriating, selfish things. From what I've generalized over time, they are either the inexperienced ones who don't really think about what's going on around them, are too fearful of the others on the road to make logical/informed decisions, or they are dipsticks on fixies who break all the rules because it's just too hard to stop or because they are just so hip the rules don't apply.
I don't think there's some deeper meaning behind it all, I think that some cyclists are courteous and skillful when sharing the road, but many of them don't really know what they're doing or think that the world owes them something because what kind of asshole drives a car anyway?!?! It's the latter ones that ruin it for everyone.