Lmao! Hilarious.<quoted text>
Boy, you are one dumb fool.
The KKK is the black man's nightmare.
Arrest, every black man's nightmare.
I know you are hopelessly lost. Grammar must not have been taught in ghetto public school #43 that you attended until 6th grade and then dropped out to sell drugs.
Your anger shows that you are wrong.
You are clueless and without a simple elementary education.
Nightmare would be the possession. You had to add "every" to make the singular term plural. Use of the word "the" in the manner you used it would cause the sentence to be general. Man's is still singular and shows possession. Sentence structure, what grade was that taught in?