I don't doubt it. As a long-time urban school teacher, I have witnessed many of those events myself.
My point is not that those events don't occur. My point is that the author describes the events in the most base and demeaning way possible, while completely ignoring the many good black students who are just trying to get by.
The bottom line is that the author of the "essay" is not really trying to give us folks any useful and balanced information. His wording shows that. He is goal is to stir up racial hatred. And we shouldn't fall for it.
I don't think we can discern what the author's "goal is". That would be reading his mind. And the "useful and balanced information" phrase, is, I'm afraid. straight from the textbook of political correctness, commonly used by the MSM to obfuscate the ugly truth, but not required elsewhere.