Being an ally means owning the problem of racism in white communities. Pushing the problem to black people means supporting oppression.
For those who need a translation: Think sexism. Men need to own the problem. They need to admit that there’s a dynamic in male behavior that negatively affects women. Even if you feel like you’re personally not a sexist: As long as you center around women’s behavior (how they dress, why they shouldn’t feel hurt by sexist comments, etc.) you will support and protect sexist dynamics.