I don’t think class solidarity will NECESSARILY beat race division, though it will probably lessen race division. Nor do I think class solidarity will necessarily beat (eliminate) sexism / patriarchalism. If race division (or sexism) is only a tool used by the .1% to maintain class division and hence the dominance of the .1%, how do you account for the fact that sexism and racism are commonplace among the .1% themselves?

Racism in my view is older and more deeply entrenched than the class struggle, and patriarchy is older and more deeply entrenched than racism.

Sanders is essentially a materialist determinist. He believes that economic inequality is the root of all inequality — fix economic imbalances (class structure) and you will have a free and equal society. I wish that were the case. Of these three forms of oppression, economic inequality is probably the easiest to eliminate.