I think a Tesla Hater driver. Another thing is, my avoidance sensors didn't react, no vehicle applied to brake from the onboard system. <iframe width="560" height="315" src="Idiot DRiver / Embed Player" frameborder="0" allowfullscreen></iframe>
Did he hit you? My wife was on Autopilot and was hit by a 18 wheeler as he changed laned into the Model 3. Autopilot didn't move to the right most lane or sped up to avoid it. However, AP did kept the car straight so everyone in the car was okay. Same type of hit as this video but not as dramatic because the Model 3 is built like a tank with awesome Autopilot keeping the car straight.
Or just inattention? The truck had right blinkers own, indicating intention to merge into the right-most lane. Perhaps, he simply did not realize you were there?
Doesn't look like road rage. Looks like he wasn't paying attention, started moving right before he cleared you. If it was road rage he would have messed with you a bit after pulling front of you.
He threw a gang sign down when he passed, or a white supremacist sign or something: That's his glove hand waving showing in his right hand mirror. Bottom 3 fingers extended. At least his right turn signal was on!