I for one have not seen any trend for rudemess bewteen airline types except that on the "low cost" ones the staff are generally busier and slightly more abrupt because of it. I vertainly have never seen crew on a low cost being rude.
If I was going to generalise I would say that the least friendly cabin crew have been BA although saying that I have met some delightful BA crew for whom nothing was too much trouble. I don't blame the crew for this, it is a management attitude that demoralises and produces a lack of interest amongst some crew.
The friendliest crews I have come across as a rule have been on United and American on internal US flights. In mitigation though they were perhaps nice because they don't get many young Englishmen in a suit flying and so I stand out from the crowd.
My long winded point is that in general, smile and the world smiles with you. Whilst most airline think theat they pay their staff to smile I have found that if I smile first then the one I get back is genuine, not corporate. I think it may have been Flaps who nailed me earlier this year for referring to a flight attendant as "two legged in flight entertainment" but in seriousness it is not a job I could do, I'm too miserable and I admire anyone who works those hours.