You correct someone else’s driving
What’s worse than someone who corrects your driving when you’re behind the wheel? Well, the answer is: someone who doesn’t have a driver’s license yet, but thinks he (or she) is an expert. Of course, your intentions are totally pure and you want to keep people in the car safe, but you are not actually helping them, instead, you risk annoying them, causing a possible accident, and having yourself labeled as a ‘back seat driver’.
Therefore, when you are a simple passenger, try to refrain from driving comments, the only exception being when you actually notice a potential danger that the driver did not notice.