Same with bus drivers really, a small minority who give the rest a bad name. The worst think I find is that as a considerate cyclist (rarely, but I do cycle sometimes), car driver and PCV licence holder (although not at the moment a bus driver, not modern ones anyway, but I have done it for a short time in the past), I seem to constantly suffer from inconsiderate and downright stupid cyclists, car drivers and bus drivers, and lorry drivers, when doing any of the above, and in quite a few cases I've ended up doing things that from the point of view of the other road users would be inconsiderate at least, e.g driving a double decker bus a few inches off the back wheels of some cyclists who were illigally riding side by side down and preventing me passing, despite knowing I was there and me giving them plenty of time to get in line, then when I did get a chance to pass giving them much less room than I normally would and cutting in close infront of them (I still made sure I was safe, but I was much less generous than I normally would be). Really, I do think some of the best road users out there are motorcyclists, again you get idiots but they seem a very small minority compared to other road users, at least if you discount the 16 year olds on 50cc bikes with L plates who only ride for a year until they get their car licence.