It's not that difficult to just shut up and keep driving. That's the least I expect and in return i give them a 5 star, sometimes I even tip generously.
Imagine if you are rude to your manager and your team mates. Would you expect them to give you a 5 star rating during appraisal review?
Every job is hard work. No one is paying me out of his goodwill; I have to put in my 100% effort to get my salary.
If you can't be a little civil or polite, atleast just shut up and keep driving. That's all I expect. There is no excuse for rude behaviour, doesn't matter what the job is.