Maybe he was admiring your car
Possibly!
They're just very bright. It's random for me. Some days I'll get lots of drivers flashing, others it'll be fine. Has a impact on a crest or dip in the road. It does make very conscious.
I know what you mean. The crest of a hill is a key one as oncoming cars are always in the low beam area of light just as a result of positioning on the road and the LED are ridiculously bright so I can understand why they'd think you have the high beams on. Nothing that can be done about that though and I'd like to think that any halfway experienced driver would realise that, but it's rarely the case...