No, the reason for this is that the teacher asked them to think about the word 'cannibal'. The word is located two lines above the joke, in the original post.
And, like Ves said, the kid was totally unprepared so threw in a joke. It had only very limited correlation with the topic. The question was was the JOKE racist! Secondly we have no idea which 'natives' we are talking about. What if the person had in mind South American natives? Why does Africa pop up? It's silly.
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