Im not ignoring this - I'm willing to accept this. As long as you're willing to accept the guy was racist.
I understand what the concept of racism is and am not convinced, at this point, that it applies to him, as stated above fro the reasons above. "Everyone hates me because I'm black" is not racism, nor is a response to Root specifically, as it seemed to be phrased. If more comes out showing that he was targeting white people as a whole as opposed to specific people he felt wronged him, then I would easily change my tune. But one statement among many conflicting ones is not enough to use such a specific label, no.
At best, calling him racist is errant, lazy word usage. I'd say he was paranoid delusional with the main focus being perceived attacks on his race and sexuality, as an accurate definition.