They're not friendly if you start asking about whether or not they actually believe that an armed revolution would succeed.
I do just that every once in a while. Asking questions about their beliefs and stuff. Lemmy is more chill in general and hexbear looks like it is too. The outliers are not that common IME.
Interesting, because that has not been my experience. On Hexbear or Lemmy.ml. Was banned from both. And I call myself a communist! But to them I'm a "lib" because I don't want to commit genocide.