A classmate of mine on Facebook has horribad literacy skills and is a Cop

Your top caption is missing a verb. "Why is a guy who can't spell most words, and has very poor grammar" would be a better alternative.

Also, the word "cop" should not be capitalized in your title (since you didn't capitalize the other title words that aren't proper nouns).

"Horribad" is an informal word, and may not be the best choice for inclusion in the title of a meme that criticizes the spelling and grammar of others.

Horribad is a slang term. You clearly knew what i meant by using it.

The rest, you're probably right.