One of the first thing I've learned from my father and grand-father while they were driving is to lower the beams for oncoming vehicles, and give a little blink signal to notify incoming vehicle that hasn't lowered it. Like everyone seemed to be following this "standard" (Bulgaria, back in the 80s/90s).

Here (Los Angeles), even in well lit streets, or worse on the freeway, you may see someone with raised high-beams and just don't care. It's particulary bad, if you are in the right-most lane (freeway) that's for more than one passenger in the car.