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I presume he's saying that because of Malcolm X. Malcolm X (pictured right) changed his last name to X because he hated all white people and white names. (Also, his last name at birth was Malcolm Little.) Therefore the initial X is associated with black names. But in the case of Micah Johnson, whose middle initial presumably comes from St. Francis Xavier, we don't need "dog whistles", we need as I say below, what Slate called a "fog horn of a headline" when Drudge did it:
What we need is a piercing siren saying a black gunman targeted white cops because he was listening to people like...Shaun King.