'Empire' Writer -- White Guys Shouldn't Control the N-Word

White TV writers have no business deciding if the N-word should be hurled around ... so says the guy who wrote Wednesday night's episode of "Empire."

David Rambo was leaving The Man Cave Sports Bar in L.A. when our photog asked him about Terrence Howard's desire to sprinkle "Empire" scripts with that word ... and he wants it with an "er."