Her image of African Americans in the US came from images of hip hop (which she didn’t understand), the local news she saw, and other Chinese immigrants.
I think the power of this point cannot be stressed enough. If you go to rural parts of Asia, you will find people there who have never met a single black person in their lives, yet have a low opinion of black people. Why? Because the American media has long portrayed black people in a negative light, and the American media has long been the dominant source of information about black people for people in Asia. It may be repackaged and rehashed within Asia, but it starts in America.
Representation matters for this very reason, because inaccurate and unfair representation is capable of fomenting racism 10,000 miles away. It is ironic that you have to look to characters like Lt. Uhura and Geordi La Forge in Star Trek — a science fiction franchise — to find realistic portrayals of black people, but for every Uhura or La Forge on TV or film, there are a hundred one-dimensional, negative portrayals of black people.
This stuff is very hard to fight, but part and parcel to the fight are stories like this one from Minyang Jang, because when we get to know each others names and stories as fellow human beings, we can begin to see past media falsehoods.