Why is communism considered socially acceptable in the US and western countries, when Nazism and fascism are not?

To be clear, I don't support either concept. Even religious cults — for the most part — are highly supported and often OK'd.

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Even TikTok is owned by a literal Communist.
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And it is unironic and ignorant for any reasonable liberal, moderate or conservative to use a communist platform. Period.
Why is communism considered socially acceptable in the US and western countries, when Nazism and fascism are not?
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