Well, it’s their community, ain’t it?!
If you go into somebody’s club, no matter how insane you think it is - say, a Flat Earthers Association, Pizza Is Best With Pineapple Club or some Church or other - and start hanging post-its all over the place criticizing their mad as shit beliefs, they’re absolutely entitled to tear them down and kick you out and they’ll even have the Moral High Ground doing it since your “right” to loudly be a whiny insulting bitch about somebody else’s beliefs doesn’t trumpt their right not to have loud whiny bitches insulting them in their space.
Now, if they went after you for your opinions outside of their space, then that’s a whole different mater and you would be in the right, but that’s not what you’re complaining about: you’re going into a forum called Late Stage Capitalism to indulge in some “tankie-baiting” and then turn around and whine to the rest of Lemmy about how moderators are such nasty people and shouldn’t be allowed to take down your tankie-baiting posts in an anticapitalist forum.
The simplest solution to this specific “problem” is for you to stop going into their space and act like a cunt there because you don’t like them. You can even block that forum if it makes you feel bad seeing a post from there in All.
Sorry mate but you just sound like a total wanker trying to find support from the crowd to get away with being a total wanker whenever and wherever you see fit.
Worry not: in 20 years’ time people born in 2028 will all pretty much look like kids to you.