Virginia;
Swearing at, and physically assaulting anyone, is not 'rude', it's criminal. I'm talking here about the lack of service and attitude that comes with some crew. One example from me, with a North American carrier; when I got aboard and was strapping myself in, the female crew in my section of the aircraft spent the whole boarding time leaning against the cabin bulkhead with her arms folded, giving us pax a look of utter scorn. She was also chewing gum voraciously at the time. later, when serving drinks, she dropped a bottle from the trolley which caused her to exclaim 'Oh Sh*t' in a loud voice.
Doesn't sound much, but I do expect more when I'm a paying guest!