I think the real problem is this zero-sum mentality that it has to be one or the other. That we must focus ONLY on skin color or focus ONLY on income level.

In reality, race and class are intertwined. Have you read Dorothy Brown's "The Whiteness of Wealth"? I wrote a book review of it here:

https://medium.com/from-the-library/book-review-the-whiteness-of-wealth-by-dorothy-brown-fac454d9f399