This is a great example of, “It doesn’t matter if you’re right if you’re dead”.
See if you can spot what the motorcycle rider did wrong (several things, actually).
1) The rider wasn’t watching his mirrors. At the 58 second mark, you can see in his right mirror the (asshole) in the car come up on him. The rider should have seen this coming.
2) He challenged the (asshole) in the car and wasn’t ready for the asshole to brake check him.
There’s no doubt the (asshole) in the car is completely in the wrong in this situation and I hope the rider reports him to the police. That being said, once you get the license plate number of the vehicle, back off. A motorcycle will never win in a physical confrontation with a car.