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From some of what I could tell the mod, goat likely thinks of communism as dictatorship due to various countries in history. I think an ideology should be based plainly on the ideology itself and people should't judge an idealogy just based off of how it was abused.
If an ideology itself at its core is encouraging dictatorship then people won't want to associate or talk in good faith. Even if it isn't, if an ideology has a bad reputation, no one will want to risk it even if someone tells them that a variation is better.
I do believe the mod 'goat' might had had a negative bias against communism. Many do, and it's just due to the association. Perhaps communists, and idk if you agree with this or not, but perhaps communist should start fresh, and create a newer, modern, and improved ideology for todays times. I believe for that as long that communist keep using the communist name with a bad rep, the chances of it going anywhere are minimal.
He banned you for a what seemed like a lot of different issue, but most notably, from you just saying your viewpoint (or the way you phrased your responses) and I don't see a ban justified for this, however if there is even one rule you are actually violating they can ban you. I didn't see anything personally wrong with the conversation on your side, you were mostly calm seeming and decent.
I think that the definition could exclude authoritarianism. However, the way it ended up implemented in popular examples people may point to, is what people see communism as being like. Possibly that's what he might had felt about it as well base don some of his responses .
I don't think correcting this perception of communism would require a specific type or form of communism, but rather just simply do vanilla communism upfront. What I mean by that is, without centralized authoritarianism. Communism by definition, is suppose to be stateless, and classless and a lack of currency. (lack of currency can be hard to achieve for imported goods, so I wouldn't be as upset over that one not being perfect day one.) however, classless and stateless as a foundation shouldn't be difficult. Achieving it in peace with everyone around might be another story, but actually applying it seems simple.
If some countries had actually applied it, then the issue was, there wasn't a large number of them applying it this way and because of that, communism is known for being authoritarian to many, when it is not suppose to be like that.