As long as the driver isn't texting, drunk, shaving, reading, putting on make up, or doing any one of a thousand things drivers do instead of concentrating on not crashing into me, I could care less if his/her lights are on.

When I ride my motorcycle in the day time, the head light is always on (it can't be turned off) but if there is any traffic, I put it on bright. During the daytime, it won't blind an oncoming driver, but it will make me a little more noticeable. I don't do that in my car...but if there are conditions where visibility is reduced, I do.