Whataboutism is a meaningless brainworm which the user invokes in order to ignore their own cognitive dissonance and inconsistent standards. You cry “whataboutism” when @very_poggers_gay@hexbear.net was correct to point out your own double standard. “All of this sounds at odds with representative democracy” implies that you believe genuine democracy is something we currently stand to lose.
What you need to understand is that Marxists are not interested in imposing utopian futures on the world. “What do you have in its place?” is the wrong question. Better questions: What currently prevents genuine democracy? What are the material conditions which both produce and maintain it? Then you get to work on changing those material conditions and removing the real basis which produces the problems.
Whiteness isn’t fundamentally about having white skin, which is what I assume you mean by referring to Caucasian ancestry.
The simple equation of whiteness and having light skin might be approximately true inside the US because of the whole slavery thing. The influx of African slaves prompted the Europeans to reconcile their ethnic differences on that superficial basis alone. But that didn’t erase racism between nominally white ethnicities. For example, Italians and Irish people have not always been accepted as white in the US.
The basis of racism is the categorization of certain peoples into pseudo-scientific races, and Europe has a long history of excluding Slavic peoples as a distinct race from the “civilized” western Europeans.