No, there are plenty of genuine Greens and Socialists, no question about it. Quite a few post content on Lemmy without anyone bothering them.
You very specifically get a lot of heat though. This is due to how you interact in comment sections with people, and why you draw so much more heat than our entire instances of actual Marxist-Leninists.
Some people just want it at the bottom of the comment section instead of floating in the middle somewhere. If we could pin its comments to the bottom that would address this.