I heard the same arguments about 20 or more years ago. "These new damn headlights are too bright. They blind all the oncoming traffic. These headlights should be banned by law." Ofcourse the one making these complaints was my dad and xenon headlights were becoming quite common at that point, even on some cheaper cars. The only time i've had problems with "bright" headlights is when the car that i'm driving has either terrible lights (so old and tired bulbs) or the lights are not adjusted correctly and point down way too much. Funnily enough the 2 cars i head with terrible lights both had xenon bulbs. The last 2 cars that i've had so far both have halogen bulbs. No issue with headlights that are too bright. Then again me not having any issues doesn't mean that complaints from others arent valid but incorrectly aimed lights with bad bulbs are already an issue in my circle so i'd imagine that these are the people that complain about LEDs the most. I also live in the EU so yearly inspectons atleast don't let you pass if your headlights are terrible.