I funny think any of those guys would listen to a straight "You're wrong." Maybe it would be better explaining that they didn't do their incantations quite right. Like "Oh, that license plate can't be accepted because it's black letters on a white background, which puts it in the domain of the department of commerce, who have no jurisdiction in automobile accidents."
I rewired a police station once. Literally the only poster they had up about groups to watch for was about SovCits, exactly how their nonsense "worked", and how to handle them. It was pretty amusing, as an anarchist who wasn't keen on that particular job.
Not specifically, this was... 5 years ago? Something like that. Small rural town. I think I had a picture, but it's long gone.
It boiled down to "their arguments are nonsense designed to confuse you, just ignore what they tell you and ticket them. Be careful with the ones who are into homesteading, they probably have guns."