I see a lot of modern day communists who revere dialectical materialism nowadays falsely demonize idealism, and if anyone agrees with some aspects of idealism, he or she is stigmatized as a bourgeoisie shill. But this belief is actually directly going against Plato and Hegel.

Communists back then argued morality based on idealism since they knew a materialistic worldview had its clear limitations when discussing morals. In other words, to them, socialism and communism arise not solely out of material struggle driven by necessity, but out of ethical reasons.