OP, you can't change other people, but you CAN change yourself.
These people are low-lifes. And they're CLEARLY spending way, way, way too much time obsessing over upsetting you.
It's been said upthread, but if you can NOT be upset by it, but (genuinely) indifferent then they. can. not. win. If they can't win they lose. If they lose you win.
So a cheery "hello" as they combust moving their cars around to annoy you, etc. Followed up with a "lovely weather we're having"
As has been said, finding it funny.
Bright and breezy is your friend. (when they're manoeuvring their cars, give advice "back a bit, left a bit, right a bit. STOP!!!!)
You can't reason with crazy, so don't try.
Marvel at the mental energy they put into trying to upset you (pointlessly). Be amused by it.
Hang onto the fact that their lives are worse than yours. Hold your head up and behave with dignity and politeness.
Don't let them beat you.