This crap happens all the time. I like all cars, much like Need for Speed: Tokyo Drift - "That's great, you read the brochure" (Daddy's Viper).
I've had many issues with "Bogans" up my ass with high beams and I simply switch the rear view mirror. If they continue i simply up the Rammstein music with the windows open and indicate to the next lane. If they copy I then slow down a little. If they hit me their fault. I could stop, get out of the car and gather the steel bar in my back seat out, but that isn't going to solve anything in the end.
If it's threatening enough that I have to worry i will drive to some form of police station, or did what i did with my mates on a cruise one, BOX them in and give a two way stare from cars either side and have the car at the front slow them down Believe me, i still remember the looks on their faces But why bother risking ones life for some idiot with some form of anger issues/psychological problems. Might be a Glenside escapee in the car behind, no matter how good you are at fighting, a gun is a gun, a knife is a knife and you can't reverse the effects. Think smart and stay calm - and safe. Last thing you want to do is floor it at some ridiculous speed only to crash your own car or worse into someone else. That will only give them the last laugh.