One thing I've liked about riding a bicycle everywhere is that I can point my light at someone specifically. I ride on the lowest setting and pointed as discretely as possibly for someone that is traveling 20+ MPH on a parallel dedicated set of bike lanes, where I regularly encounter people with nothing reflective and no lights after dark. I ride with a light that is MUCH brighter than any car when on the high-boost setting and I will absolutely use that on anyone that flashes or drives with brights on.

Back in the day with my 1971 FJ40, I had A-pillar spotlights for classic off-road, and would do the same with them. People that drive around with brights on carelessly deserve fully blackened and burned retinas.