I wouldn't have a problem with cops ticketing people for rude gestures while driving. Allowing that encourages road rage incidents. And while we have a first amendment right to be rude, I think while operating a vehicle the driver's priority should be on its safe and lawful operation.
Those would be some extremely arbitrary tickets. How would that not be escalating things to the absurd? More and more confrontations, more and more assertions of excess authority and power, more and more retaliation against it.
I’ve thought a lot about “flipping the bird” over the years, because the belligerence of especially males is very interesting to me. There’s nothing inherently rude in a raised middle finger, there’s absolutely nothing wrong with it. Where things go wrong is in the head; it’s how the person interprets it: the ludicrous and childish way (taking offense) or a rational way (ignoring it, waving or blowing a kiss or otherwise mocking it, or vocalizing whatever your upset is).
There’s nothing wrong with anger, it’s just how you express it that matters — namely, don’t express it with your fists or a gun or any other display of authority.
People use “that’s rude!” prudishness as a mindfuck manipulation of other people. The answer to such an allegedly "unruly" society just might really be
LESS RULES, less control, less oppression, less trying to force people into line.