Hmm, interesting thread - what happened was unlucky indeed - but its something that could have been easily avoided. If someone cuts in front of you - u have the right to beep the horn, or flash the headlights. If they do anything further (like slam on the brakes) - no need to get annoyed/angry and go beside them and wind down the windows etc - take their numberplates. Since you were near the police station, u could have just gone in and gotten them to chase him up. This way, your car is safe, and more importantly your safety. Sounds like a cowards way out? No way in hell is that a cowards way out.
These days, you never know what people are carrying in their cars. I used to carry a cro-bar in my car eversince some dudes threatened me at Monash. But stop for a moment, take a few deep breaths, think rationally - and everything will be fine.
If you really wanted to pick a fight with him, make sure that (1) you can take him on, and (2) be prepare for any charges against you if you do drop him to the pavement/road and he gets injured.
Pretty much everyone here is a rational skyline driver, so lets keep it that way and not get on to the papers as if we are the only hoons around - just learn to ignore what the other idiots are saying about us and our cars. Even if its racism - if it dont bother you, it will bother them more.