Regarding the title of this thread, it's impossible... because there's no such thing.
There is no such thing as an innocent black teenager? Does that mean they are all guilty of something? Do you care to enlighten us further with your racist wisdom?
If "blacks can't be racist", then it's only fair to concluded that they can't be innocent, either.
So if A does not equal B, then C does not equal D? This appears to be a propositional fallacy.