Slam on the brake and say to the cop you were avoiding a near accident ahead of you when he rear ended you.
That or start slowing down to 20 mph. He'll get off your ass. Then when he starts trying to throw the beer bottles at your car and keeps on your side, start swerving back and forth in the lane a little bit to make sure he notices(especially let him start watching your hands) and then do a pit stop maneuver(jerk your hands to the left or right but not actually touching the steering wheel).
BTW Opinions are like butt holes...