What happens if the bad driver is around you when you are driving and he/she kamakaze near you?
If I'm driving a faster car, I'll just shine my high beam once or twice. If that idiot KIA still doesn't give way, I'll just overtake it on lane 2 and sped off with no further confrontation.
If I'm driving a slower car, I'll just humbly change to lane 2 and keep in lane unless there's obstruction ahead. Simple as that. But our bastard drivers are too egoistic to adhere to such simple driving etiquette.