I rarely (more like "never") flash my headlights since I don't see any practical use of it.
I sometimes see players flashing when they were confident to pass but I closed their desired lane.
And then there are these players who constantly flash their headlights. I imagine somebody resting his finger on the appropriate button all the time. Or maybe they have made some mechanical tuning to their controller/wheel.
(When) do you flash your headlights?
Some players are so stressed when cornering they actually press L3, which is stupidly assigned to flashing headlights. That’s why some players “constantly” flash theirs