Racism and sexism and other forms of oppression need to be fought against literally because they are tools of the ruling class!

Anti-racism without class warfare is worthless, of course, but class warfare without anti-racism fails to combat one of the most powerful tools the ruling class has to pit the working class against itself.

How do you propose to convince white workers to unionize with nonwhite workers without anti-racism?

no.

racism may have been a system created to facilitate capitalist (and, mostly, colonialist) exploitation, but it doesn’t just disappear like this when capitalism is overthrown.

just look at the USSR still doing cultural genocide in asia after the revolution. look at online leftist spaces being mostly white; why is that? look at the racism that permeates the fediverse, which doesn’t have the profit-driven algorithms.

the fight for Black & Indigenous liberation is intrinsically linked to the fight for worker liberation. one isn’t complete without the other.

The only war is class war, but to fight that war you need solidarity, and you build solidarity by acknowledging and accommodating the diverse identities that compose the working class. eg If you can't demonstrate to victims of racism that you will consistently and directly oppose racism then you are in fact neglecting part of the class struggle and missing a chance to strengthen the organization of your social class.