You can always just have multiple accounts, if you're specifically trying to avoid Marxists but also liberals, dbzer0 is probably what you want, but you could also have a Lemmynsfw.com account as well.
Lemmy is lacking in Anarchist and NSFW instances from what I know of, so either you will want to go with a general purpose instance that doesn't block NSFW instances and deal with liberals and Marxists also federated with the general purpose instance, or maintain 2 accounts. Some apps let you swap at the press of a button without needing to relog in. I personally have a Hexbear.net account and a Lemmy.ml account, the former for relaxing and checking the news, the latter generally for trying to get liberals to read theory, so I use Jerboa for Lemmy.ml and Hexbear.net through my browser (so I get access to the unique Hexbear emotes). Works well for me!
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