You have to be careful who you correct about their awful driving. I was driving on the highway and for about 10 minutes these jerks were behind me with their brights and their fog lights on. Finally I couldn't take the glar in my mirrors anymore, so I slowed down to let them pass and then flashed my lights at them. They kept their brights on, so I left my brights on for about 30 seconds and sped up so they'd notice.
This was a car full of 5 jocks, as I later discovered, and most of them turned around and looked at me when I put my brights on, but none of them seemed to get the clue, their brights stayed on.
Oh well, I tried. My exit's coming up and they get off at the same one, I end up in front of them at the next light, they're shouting something out their window (couldn't tell what, my windows were rolled up). They followed me for a while, aggressively (I sped up, they sped up, I slowed down, they slowed down...), it seemed obvious that they were looking for a fight or something, so I pulled into a parking lot near my place (don't want them to know where I live), and parked. Sure enough, they park close to me and start getting out of their car and walking towards me.
Now, I am not a stupid person, I know that I would have little chance against 5 jocks unless I ran them over with my car, which I would rather not do. I would also rather not have them beating on my car. So I wait until they're good and out of their car and then I slam into reverse and take off, it took them long enough to get back into their car that I was able to lose them in the meantime.
So I guess that's the last time I'll flash my lights at anyone for having their brights on.