i get "flashed" (high beam wise) by at least 1 person a day as I'm on the road for near 1000kms a week for work. I also live in Hobart, and my car is parked out on the street every night. I don't loose sleep over it........
Just don't make anything personal. I see people flash, hear them honk. But I never swing round to look. Just keep an eye on the mirrors etc. The moment you swing them the bird, gesture, or mouth "get f@$ked" etc then it becomes personal, which means they're more likely to remember it. Just plead ignorant, even if you do cut them off and almost makes them tailgate you!