I've had several accidents while on my bike in Oxford, about half of them my own fault, involving only me and the road - I've always been extremely careful when around traffic or pedestrians, and I NEVER go through red lights or ride on the pavement (except where it's also a cycle path).
The nastiest accidents I've had have been caused by other cyclists: one woman who I was overtaking decided to ride into the middle of the road without warning, without looking and without signalling. She was about 300 yards from the junction that I presume she intended to turn right at, and travelling at less than 10 miles an hour. I had no chance (and luckily for her I wasn't the bus that was 100yd behind me, otherwise she'd have been dead outright).
The second accident was when a cretin was cycling on the pavement, I was on the road. He decided to pull out onto the road (again, no warning, looking, signalling, and not in an obvious place, either). Again I had no chance. I broke my wrist on that occasion and how have a 2 inch screw through my scaphoid. I also had massive bruiding on my leg where I'd been run over by a car as a result of the crash. I wish I'd have taken the cyclist's details down: though I am hugely against person injury claims on the whole, where they have been caused by wrecklessness and result from someone's abject stupidity, there may be a place. I consider myself lucky to be alive after that one, and have rarely cycled since (now I commute a very long way as I have a new job so don't need to cycle to work).
While the most idiotic behaviour I've seen has arguably come from cyclists, I have also seen some very considerate and good cyclists about. Likewise for cars (and I cover a lot of miles, I see a LOT of cretins on the road, particularly middle lane drivers who reduce 3 or 4-lane motorways to 2-lane motorways... thanks, idiots).
As with all things in life, there are good and bad examples. Don't hate all cyclists because many are cretins. Just hate the cretins.