Consider the following extended argument:

Well, I think our previous example is hate speech only if it was deliberately done in order to incite hateful emotions toward African Americans or some other social group. But our previous example was not deliberately done in order to incite hateful emotions toward African Americans or some other social group. So it's not hate speech.

And it's safe to say the previous example was not deliberately done in order to incite hateful emotions toward African Americans or some other social group. For it's unlikely students had such hateful emotions after reading the example.

In addition, it's safe to say it's unlikely future students will have such hateful emotions after reading the example. For past students haven't.