I've seen "Tankie" pulled out on Lemmy and Reddit over things like:
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Suggesting a revolution is required to stop global capitalism, and that we cannot vote our way out of Capitalism
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Countering common narratives that paint US Geopolitical Adversaries and Existing Socialist/Communist regimes as comically evil villains.
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Criticizing the western perspective on the Russia/Ukraine conflict, and by extension criticism of Ukraine, or praise for Russia
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Suggesting that violence against Nazis is ok
I mostly get the impression that people don't like violence, and dislike the idea that capitalism may need to be opposed through violence. Though I've also seen it thrown out at suggestions that capitalism should even be defeated at all. It feels like a poison tbh, we really should just be uniting against capitalism.