The last time I witnessed this was whilst parked up at a gym / hotel complex.
A man parked his shiny new M series BMW in the Disabled bay, slung his sports bag across his shoulder, off one assumes for a workout or a game of squash.
So I left him an aggressive note on his windshield making it very plain what will happen next he does anything so obviously crass and unnecessary.
He's not to know I live 120 miles away; the point is still valid.
However, I am happy to tackle anyone, face-to-face when I feel it's justified. I've made citizen's arrests, been in court a few times for taking on tw"ts and won't stand for many examples of what might be termed antisocial mannerisms, be it littering, smoking in bus shelters or spitting in the tube.
It's a wonder I've never been properly thumped! One guy tried, on the tube after I'd made a citizen's arrest & we were on our way to the next station after a set-to, his 1st try was parried, my reply was clapped by the others sitting in the carriage. People don't expect a guy in a suit to punch back hard to the face. Several times.