@Nadiyah This is not really about racism, though it could be indirectly. Sheep are usually white in colour, and when we say "black sheep" we mean somebody who is not like the rest of a group or family. One common expression is "the black sheep of the family". The origin is the proverb, "There is a black sheep in every flock." (A "flock" is a group or herd.)
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is it racism ... :))
-Nadiyah-