A decent amount of the people Bernie brought over used to be alt right or libertarians and never shared in any common struggle enough to develop class consciousness or were just bougie elitist to begin with. Now they aren't hiding it to help the campaign anymore. Underneath all the bad faith criticisms the left does have a problem on racial issues, but it stems from people using theoretical understandings of marxism as a cover for how few marxist actually go through the type of mutual struggle alongside minorities that would create a shared class identity.
I'm not even sure that's a negative. If you are a lib then, yeah, everything about your ideology says you should vote. It's probably the most useful thing they do with any of these platforms.