disengage
gotta love "allies" that save their homophobia/transphobia for people they disagree with.
There's a contingent of power users/mods/admins that range from neoliberals to social Democrats/reformists, and view anyone more radical than the Democratic party/Bernie as red fash.
That does include anarchists if you have any heterodox opinions about Ukraine or refuse to engage in their red scare propaganda. they have been doing a smear campaign about the "tankie troika" of Lemmy servers for a while now.
They even have a snark comm for exactly that.
I use percolators, I have been outed as a leftcom
they're really good for when you want to make a ton of coffee 
I hope every centrist extremist gets the Havana syndrome that they deserve
The only person I've encountered waving Stalin flag at a protest said they were a Maoist when I asked
red scares have been a global phenomena, not one isolated to the US. Pointless red baiting in response to what Trump being a fascist is about what I've come to expect from Bernie, the guy who can't call it a genocide.
Declassified CIA documents from the time even say that Stalin was not so much of an autocrat as commonly mythologized.
these are the people complaining that it's other people who are in echo chambers
I've done quite a lot of in-person anarchist organizing over the years. The people who are always the loudest about being sectarian are often the ones who end up showing up the least in the end.
At this point I don't even bother getting into fights with them or trying to educate them. Combination of they tend to lose interest on their own anyways, and the task at hand is more important than trying to sway someone who thinks they know everything.