Cops will be dealing with all sort of people many of whom will be complete assholes and they should be trained to deal with it and de-escalate. I'm a broken record on this, but it's the fundamental problem with policing in this country, they overreach all the time and assume that every citizen they encounter is looking to blast them with a hidden gun. It's just not rational or reasonable and should be a big deal in a country that brags about civil rights.
In this situation, when Hill won't lower his window, just yell that you're gonna give him a ticket. All Hill is legally obligated to do is show license and registration (I think the video showed that he did this before rolling up his window). If he won't open the window on demand, tell you you need to give him his ticket and he can move along (also probably needs to return his license and registration). If Hill wants to be an asshole and call his lawyer over a fucking speeding ticket, fine, let him know he doesn't have to talk, but he's still getting a fucking ticket. I just don't think it's all that difficult in principle.