I'm confused why this is even seen as a topic for discussion. Drivers assault other drivers as well as cyclist. If we were to dig enough, we can probably find a example where a cyclist committed assault and battery to another cyclist. Anyone that's been to a bar as a teen or young adult knows that you have to be wary of those that anger easily.

Assault in many states only requires that one feels reasonably certain the other person intended to harm them. Though proving that in a court will have some hurdles. Even with video evidence. Unless it went to the next step of battery where the victim will have injury to show as evidence also.