Here's the full bodycam footage. I was right about him failing to ID.

https://www.youtube.com/watch?v=5i88VDrI3VA

He commits a misdemeanor 21 seconds after the stop begins.

Cop: "Give me your driver's license, registration,"

Dude: "No."

Cop: "... and proof of insurance."

Dude: "No. Call your supervisor."

That "no" is enough to arrest him. Most cops won't do it, they'll have a conversation about it instead of just busting out the cuffs, but if you go out of your way to piss them off, sometimes they will not. We're past reasonable suspicion at that point. He pulled him over, explained the reason, and asked for ID, and the guy refused. This is an excellent way to get arrested, and refusing to cooperate with the arrest is an excellent way to get dragged out of the car and thrown around. IDK what the guy expected to happen. The only reason this is news is because the cop hit him in the face, but this was 100% a dude-created situation from start to finish.

Whether or not they have probable cause is a matter for the courts. Polite or not, you're dealing with individuals who have little to no oversight and even if they do something illegal they often don't have to answer for it. The moment to insist on probable cause and reasoning is afterwards. Let them rack up their bill first.

So they didn’t have probable cause

Grounds for a traffic stop is RAS, not probable cause. It's a lower standard. Regardless, the officer clearly met both standards, because (according to him) he literally saw the driver not wearing his seat belt. That's the grounds for the stop.

he politely asked to speak to a supervisors

Which was completely fine. Not handing over his license was not.

This kind of shifting the reason for why something bad happened, from what you actually did that caused the bad thing to some other totally different behavior, is a classic tactic of people getting arrested and narcissistic family members the world over. Anyway, he got arrested for failing to provide ID (and then refusing to get out of the car), both of which he's required to do on a traffic stop. Asking for the supervisor was fine, it was unrelated to anything.

Also, as a side note, the supervisor will pretty much never override the cop in circumstances like this. All you're asking for is for another person (often with less patience and more authority) to come there and then assist the other cops with whatever they're planning to do with you. It shows a total lack of understanding of how anything works to demand a supervisor thinking that somehow once they arrive, your situation is going to get any better.

He just didn’t comply with what seems like an illegal order.

You can't argue on the side of the road why the cop shouldn't have pulled you over. If that were the system, no one in the history of the world would ever get a traffic ticket, because they would just say "I don't agree with the reason for the stop, so no you can't have my ID" and everything would grind to a halt until the cop's shift ended and the person got to drive away.

The system is, the cop can write you a ticket, and if it's bullshit, you get to go to court and fight it (in a calmer environment with an unbiased judge in charge of the proceedings and with you having plenty of time to prepare and even get a professional to help you argue it, if you want.)

Honestly, I'm just going to stop there. You guys just have no idea what you're talking about, you just see "Cop man bad!" and that's as far as it goes, and every other bit of fact and logic has to bend its way around that central axiom. IDK man. Good luck. I hope you do not get pulled over and try this, it would not go well for you if you did.

What can I say, I'm talented I guess

You gotta talk to the legislature, tell them that if someone gets pulled over the rule should be that they get to just tell the cops to go fuck themselves, and it's okay because ACAB.

Start a movement, see if you can get a whole city where the city council's on board with it. Try the experiment. Things aren't as fixed as you think they are, a lot of it is changeable. (Well, on the local level at least, IDK if we wait a year you may get your fantasy coming true where the federal level is defining what law enforcement is, and no one who's a "civilian" can exercise any control over it.)