This is why it is a utopia... it is assuming class is the only antagonisms in society, yet that is far from the case.

Have... have you really never read any Marx or Engels before? Every state that has ever existed arose out of the contradictions between the various classes that existed at whatever point in time. To disagree with this is to disagree with dialectical materialism, and unless you can provide me with a better framework through which to analyze history and the universe, I'm gonna stick with dialectics instead of your "hurr durr utopia" nonsense.

The USSR was totalitarian with respect to the KGB/NKVD and Gulags

What does "totalitarian" even mean? The bourgeoisie would say that a dictatorship of the proletariat is totalitarian because it represses them as a class. Does that mean a DotP is a bad thing? See how useless words like "totalitarian" are when attempting to make analyses?

The USSR was fascist in the sense that they were authoritarian and heavily promoted nationalistic/patriotic tendencies and the military as cornerstone of their society.

This is such a shitty definition of fascism, I don't even know where to begin. You noticeably ignored how fascism preserves private property and thus the bourgeois class, and didn't mention corporatism, which is an inherent part of fascist government. Fascism does not mean what you think it means, it is much more complicated than that, and by definition it is a far-right wing ideology, despite what some fascists might say about "borrowing from both sides of the spectrum."

You're right that it is impossible to be 100% fascist and 100% socialist.... but it is very much possible to be 50% fascist and 50% socialist or whatever percentage you want to put it at. It's not as neat and clean as you'd like to think it is.

I don't even know what this is supposed to mean.

Now please, since it's obvious you are actually the one who needs to "educate" themselves, go read some Marx and come back to me when you actually have something substantial to say.