Why do people hate blacks?

I keep seeing the word "nigger" posted everywhere and it appears a lot of people here hate black people. Why?

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This possibility is rapidly declining to the same levels as common superstitions and myths however, in fact it may even be lower at this point since even myths like Atlantis can be construed as elaborations of real world events like the eruption of Santorini and the demise of the Minoans.