You’re meanest and laziest with the people closest to you. The reason is you can get away with it.

You don’t react to the boss or the police or even to a stranger because you can’t get away with it. You choose to be reactive with the people closest to you because of just that; you can get away with it. You go nuts in the car in a way you wouldn’t react face-to-face because you feel safe in getting away with it. - Seen at Tools To Life