As ex Virgin Crew, and now working for LCC, I have to say that its by choice I work for "Low Calibre" as it has been accused of being on this thread (to which I take great offence) and not because Im not upto scratch as Hawaiianhostie has insinuated!
This is due to several different reasons; We have better union agreements, more days off, work less hours, get longer trips downroute and earn twice as much money!! (at my current airline although I know this isnt always the case at others)
Beleive me the attitudes are the same at most airlines, you will always get one who has this so called "chip on their shoulder" wether they are BA, Virgin, EasyJet or even Qatar. But if you get on board with this attitude as a passenger then of course the crew are going to pick up on it and behaviour breeds behaviour.
We all chose our airlines for our own reasons, not because we are not good enough to work for the larger airlines. And I think we'd all do well to remember, we all do the same job just in different colours!