from my experience:
when I'm driving, cyclists and pedestrians are suicidal idiots. Other motorists give me dirty looks for only passing cyclists where it's safe to do so.
when I'm on my bike, pedestrians are suicidal idiots and motorists aim at me. Other cyclists give me dirty looks for daring to stop at red lights
when I'm walking, cyclists and motorists aim at me and other peds hold me up by walking slowly and erratically.
in short, all three classes contain plenty of idiots
I think Mongoose has summed it up quite nicely there.
With regards to the videos I'm in two minds about them. Some of the drivers he is having issues with admittedly are driving like idiots and should have the book thrown at them. But then the cyclists arrogance and smug, self satisfied attitude makes me loathe and detest every fibre of his being. I'll bet he goes out on his little patrols looking for people he can put up on Youtube, and subconsciously he probably causes a lot of confrontations.
I think you summed it up nicely, he seems to go looking for trouble.
The first one fair enough, but he just dilutes any sympathy with the rest of that utter shize, and as soopah pointed out his road positioning looks odd, no way near the side 
I think he rides a trike - look at his feet peddling
Here's another knobber doing the whole "angry shouty shouty headcam I'm awesome" thing.
http://www.youtube.com/watch?v=SIyG5BqjM10
The cyclist went over the line as well, shocking he thinks that worthy of a Youtube post, he has fingered himself as well.
What i don't understand is why he is reporting both registrations of the accident, surely one person is at fault (it looks like the Audi shunted the Mondeo) yet he thinks its right to report both their registrations on Youtube?
