Definitely not all communists or socialists, at least that was not the case for the subreddit. I’m pretty sure the mod for this community put out a clarification post if you want to check it out.

Hard to tell bc so many people on Lemmy use “Tankie” as “anyone to the left of me”

Noone except some liberals refer to non-authoritarian communists as tankies, and even then when they do that they know they’re being misleading