Explain? What part of that is putting down white people? Those are things I and many people I know say. It doesn't say all white people say those things, but even if it did it wouldn't be racist. It just isn't discriminatory. Racial humor is not the same thing as racial discrimination. It's just a funny comment, which is accurate, on unique phrases to certain dialects. A similar post about another dialect would not be racist either, as long as it isn't discriminatory or inaccurate.