If someone's driving annoys you, don't try to 'educate' them. Leave traffic policing to the police and driving instruction to professionals. Be patient in traffic. Don't push into traffic queues. Set an example to others.
Courtesy encourages cooperative, safe use of the road.
Apologising to the other driver when you make a mistake reduces confrontation and helps to defuse anger. Avoid making eye contact, which may be seen as confrontational. Don't respond by accelerating, braking or swerving suddenly. The other driver may think that you are looking for an argument, and you could lose control of the car. If you think you are being followed, try to drive to a busy public place, or a police station, before you stop.