Black Men and Public Space (Shota Takemura)

As professor said before reading this article, she explained the difference between the comfortable space of Asian and that of Westerners. I got an interest about it. For Asian, they bow when they meet. Therefore, they need the farther space than Westerners. On the other hand, Westerners hug with each other when they meet.
But, on this article, the different case is raised. According to the first example, the black guy is with long hair, on the military jacket. He used to be graduate student. He scared the white woman.
I think author is good guy. He is black and looks to be dangerous. However, I think he is good from this article. And, I think that threat is vague, invisible thing based on the stereotype for a long time. For example, the discrimination for the race is the threat.