Hell of a conspiracy there Linus. I've no idea what you mean with your scapegoating comment but it appears you've just met one of society's many dickheads. A sub-culture that seems to be on the increase. And they can be motorcyclists, cyclists, motorists, pedestrians or people wearing hats. Makes no odds. Individuals who clearly just don't give a toss about anyone else. My commiserations, it's a shame about the dashcam footage.
The only thing we can do in situations like this is to take a deep breath and make more of an effort to treat people how we would like to be treated.