Wow, he's got bigger cajones than I do. I expected a taser when he started to leave.
The only thing that I would question is his initial contact with the police. While it is totally legal to video tape, when there is not a confrontation or the officers behaving badly seems like baiting to me. But, yes, I know, he did nothing illegal.
If this man was just walking down the street minding his own business while open carrying and these officers approached him asking him what he was doing and wanting his ID then this would not have been a valid stop.
But, this man was obviously seeking a LEO encounter and his aggressiveness earned him one.
I would also go so far as to speculate that without the video, this may have turned out completely different and not so good for the open carrier.
IMHO, not the best way to win over acceptance by law enforcement officers, legal or not.