It's not a fetish it's politeness.
I flash a lot (with headlights as well), and I hardly ever have to replace bulbs.
Someone did that to me when I was coming up a hill which was single file at that point (leaving a car park, he was in a layby on the right). I could hardly see a thing. I don't know if he was on full beam or it was just the angle - he had no need for headlights while being parked. I stopped and engaged my full beam (still couldn't see to get past him safely) until he (eventually) realised what was going on and switched them off.