It should be Mr. Kettle is pressing charges for a hate crime because Mr. Pot called him black.
Mr. Pot is pressing charges against Mr. Kettle for being black, as in Mr. Pot doesn't like Mr. Kettle for being black even though he himself is black; it is consistent with the original idiom denoting an individual criticizing someone else for the same thing they themselves are at fault for.
I thought you were mocking my old avatar for a second.
That's because you're stupid.