Passive-aggressive is getting in the fast lane and going slowly while waving at the guy behind you in an effort to prevent him from passing. Why not just let the idiot go?
Someone not too long ago in Oregon (whom I met a couple times)had had a bad day, broke up with his girlfriend, drank too much then got behind the wheel. Some woman did exactly what I describe above to him and he completely lost it. Forced her off the road after chasing her for a while. When the cops arrived he was trying to drag her through the drivers-side window that he had shattered with his fists moments before. He's serving time now.
Another time, I was driving and some dufus was trying to parallel park in downtown Portland and having a hell of a time monkeying his car into the spot. I got tired of waiting and went around him. As I passed I could tell he was yelling at me for some unknown reason so I gave him the one-fingered salute. This idiot chased me all over downtown screaming at me at every light "I'm gonna kick your ass" until I pulled up in front of Central Precinct.
Finally, my girlfriend and I were driving around SE Portland when she accidentally cut this guy off. He followed us for miles, chasing us at high speed and even doing a power-slide at a stop sign trying to block us in. She and I switched places at a stop light and I watched this wacko a couple cars back get out of his car and get something from his trunk that looked like a gun. I later learned it was a tire iron.
Fucking with people behind the wheel puts you and everyone around you in danger. Don't be stupid, let it go.