Neither driver was appropriate, I think. If this were sports with balls in a field and no machines, OK, but this is public roads with big cars, so the same rules don't apply. I stopped watching as soon as I made that determination, because it had already gone past where I thought was appropriate, from either side.
Where it started bad was when the dashcam car didn't leave enough room between themselves and the bus, and then didn't open up correctively when another car came in for merging. Even if done accidentally, there was ample time there to eventually correct for this behavior. (The dashcam driver continued making problems by intentionally blocking and then intentionally persuing the Tesla, and once I determined both were acting bad, I just stopped watching.)
The Tesla driver was awful by any measure. I've seen lots of very good Tesla drivers here in Silicon Valley and areas surrounding, so it is not something about Tesla that caused this, but something about the driver that caused this. Maybe the Tesla driver was having a bad day and just went ape bat nuts. But, it was not OK driving. If I were King, I'd give the Tesla driver a day in jail, a ticket for driving under the influence of being emotionally disturbed, and 2 year driving probation of requiring 360º high definition dashcam footage of all that person's driving, plus pay for people to go over all the driving footage and make certain the driver not do anything like that again or even close to it during the probationary period, subject to extension, further tickets, imprisonment and suspension of privileges.
If I were King, I'd also finish watching the video and determine penalties for the other (dashcam) driver, as well. But I'm not, so I can't stomach the fighting period of the video.
Silver lining: there's so many Tesla's now, that we have all kinds of drivers.