I guess you can forget but I have not yet met one car who switch their highbeams off. Yesterday I had a car right on my tail on a main road that didn't turn their highbeams off. It was so annoying and a safety hazard that I had to stop the car to let them pass. 5 min later I have another behind me.
Let me continue with another question If you stay at a B&B with only a few rooms and the owner do the cleaning of the rooms themselves. Do you leave a tip for the cleaning?
If you feel like it is every car then it sounds like a clearance/angle issue that you may not be accustomed to if you are usually around smaller European cars. If you rented a sedan and are around a lot of trucks an SUVs then their lights will look like brights to you, especially from behind.
You don't need to tip at a B&B.