Your headlight level adjuster might be stuck or broken. Have your mechanic check that it works.

A lot of vehicles have a beam dip adjuster in the cab. Mine pops out when I press the center of the light control selector.

Officially, they are to correct for a heavy load in the back. Unofficially, if you tweak them, you can flip between longer range, and polite as required.

If you watch your lights, there should be a fairly sharp cut-off at the top of their coverage. If that line ever hits a window or mirror, it will look like you are flashing them. If it's too high, either fix it yourself (generally quite easy) or get it fixed.

If people regularly flash their lights at you over it, you probably should.

Aim them yourself. You'll spent more time finding a good spot to aim them then actually doing it.

If they're LEDs or HIDs they're probably just a screw you turn to aim them. If they dont then it's basically the same thing, but in a less convenient spot. Look up the proper aiming procedure for your car, or just wing it by finding a car in a parking lot.

https://www.youtube.com/watch?v=qDudMM4J-ZE

I know the feeling. I had a rental car once for two weeks and I was more than once road-raged because of the lights. Everyone thought I was high-beaming it, but nope.

My cars low to the ground and only has halogen lamps, so if I'm ever flashing high beams at an SUV with overly bright lights, it's only so I can continue to see the road. LEDs are insane and the governments too busy facilitating record defense contractor earnings to do anything about it.