One of the things the Left loves about Marxism, is that once you enter a protected class status, you stay there no matter what...
...until the next political purge decides that things need to be recategorized to maintain their grip on power.
This isn't quite true. You'll recall that for the original Marxists, the "proletariat" (factory workers, and manual laborers in general) were the victims oppressed by "the bourgeois" masters.
The working class is no longer the darling of the left - because the white working class has been d. So rather than fighting a class war, today' left mostly wants to fight wars on behalf of groups that define themselves primarily or solely according to racial, ethnic, and sexual identity.