Perhaps some of the judgements based on a very short video clip, which does not show the driver’s face are a tad unfair? It has happened to me - I just laugh it off and blast past with a twist of the wrist when the opportunity presents itself further down the road.
Obviously we weren't there and you're right that it's difficult to make a judgment on such a short clip.
What does stand out is his attitude toward riding, other road users and the situation.