I have to laugh at the idea capitalists hate black homeowners so much that they're willing to punish 9 whites for every black.
Identitarians who want us all to think more in terms of race are the ones who're trying to divde the working class.
On the myth of class reductionism that neoliberals love to promote: https://medium.com/a-universalist-in-an-identitarian-age/mythical-class-reductionists-vs-actual-race-reductionists-187cd8d767b3
If you want to say I'm a "red racist" like King and Du Bois, okay.
As for what destroyed the labor movement, that would be neoliberalism. Check the timeline.