Because hes black.
Note that the person that said the previous statement is too stupid to know how to spell the simple contraction "he's." This moron is also unaware that Jackie Robinson has been dead for quite a while, meaning it is incorrect to say that "He's black" -- the only intelligent statement would be "He WAS black."
Oh, and BTW, Robinson got the nickname because he was quite adept at stealing bases -- he's one of the few players to ever steal home in a World Series game.
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