I know the new projector style headlamps have a bluish light that is more prone to glare issues.
But that doesn't account for everything I have been experiencing.
GA doesn't have an annual inspection to make sure headlights are properly aimed or that they are not too bright. I suspect some cases involve lights that went out of alignment from a fender bender or just someone piddling around with the adjustment screws.
Also, some people buy replacement lights which are sold as "for off-road use only" and have brighter lights than are legal.
When I rode motorcycle, I would use a bulb that had a legal low beam and an illegal high beam. My logic was I would never have the brights on at night with traffic around me, but I primarily used the bright light to catch peoples attention during the day - during the day, motorcycles tend to disappear for the driver looking for cars - at night the low beam headlight works fine.
I was very conscious of using my brights at night. As much of an image as there is around bad-a$$ tough motorcyclists and gangs, any intelligent person realizes you do not want to piss off someone in a 4 wheel vehicle when you are balancing on 2!