All you need to do to understand this situation correctly is be able to put yourself in another person's shoes. Imagine yourself an African American male, standing outside. A white police officer rolls up and points his finger like a gun at you. In our current climate, where there have been repeated shootings of black men by white cops, what else could you think besides, "that was a threat"? If you are sitting there, wanting to tell me other things that he could think, you are not trying to put yourself in his shoes. Yeah, I could come up with other things he could think too. No, I wouldn't have felt threatened by it. I'd have thought him a cheese-ball and probably laughed. But I know I'm not in danger of getting shot for no reason. If you are black in this country, you don't know that. It's really that simple. And you should stop complaining about how the black man reacted and start doing something about our broken culture.
If you can watch that video and still not understand, then I don't know how to reach you.