Are you sure they are brights? I have people flash their lights at me constantly (one of the reasons I hate driving at night), but they ARE my low beams. My car has those stupidly bright LED lights. They came with the car (factory, not aftermarket), what am I supposed to do.
So, my pet peeve would be people being jackasses when they think I have my brights on. Now, don't get me wrong, I don't mind a little flash of the headlights when people think I do. I mind when they wait until they are right beside me and then turn them on to fully blind me so I can't see at all. Or like that mud runner truck that decided to not turn their brights on, but to turn their extremely bright off road light bar on.