Going out on a low note.

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Therefore you focus your attention on the racist wording.

That was the intent of the original post.  I thought the 'test' was humorous, in fact, I had posted that in the joke section a while back.  But to publicly display it in a school environment like that, whether the teacher intended it as humorous, racist, or just plain "fuck you!" on the way out, was inappropriate at best.

Exactly this.  Perhaps long exposure to kids or school politics caused this person to lose his mind?