What I see in the video is the MC rider kicking the car, the car driver doing a knee-jerk response toward an unexpected disturbance, then a lot of overcorrection and eventual crash.
I don't see a driver retaliating against the MC rider. I believe there would have been more of a delay between the kicking and the retaliation. Instead, what we see is an almost immediate swerve, consistent with a surprised driver.
One of the things I learned is that drivers instinctively point their cars towards whatever has their attention. It's happened to me, with nearly tragic results in the past. I was driving my '76 Caprice Estate station wagon on city streets at relatively slow speeds between stoplights, and a bicyclist passed me in my lane on my left, and bumped my driver side view mirror. No damage or anything, but I had no idea the cyclist was there, in an unexpected situation, and the shock of the unexpected situation resulted in a swerve to the left. The cyclist interpreted it as an attack and started banging on my car. I kept dead straight, no retaliation at all. Turns out a cop was a few cars behind us, pulled us both over. The cyclist was frothing at the mouth about how I tried to hit him. I was calm and said I was surprised when he clipped my mirror in a dangerous maneuver but then tried my best not to hit him as he smacked my car repeatedly. The cop told me to have a nice day, drive carefully. He was having a chat with the cyclist as I drove off...
That all said, the fact that somebody was filming the situation in this way suggests there was prologue, to which we are not yet privy.