I’ve had a similar experience. I have actually engaged with the tankies in good faith on several occasions, and it has just gotten those account banned for I guess being a leftist heretic? For arguing that there is more to socialism than Marxist orthodoxy? For opposing campists? Idk, they really seem to dislike that, and these days It’s pretty obvious that the worst sin on ml is making tankies look dumb by actually knowing even basic political science.
The problem is that these are very active communities which are some of my primary interests. I’m just browsing all and not even any particular instances. I’m commenting on things I see which look interesting and engaging with the content in an area I have interest and knowledge, but I seem to be doing so in a way which defies some unspoken orthodoxy.
It’s just been very frustrating. I’ve been a pretty prolific forum poster going back to Usenet and have several decade-old reddit accounts and I’ve never felt targeted or marginalized like this for what are honestly pretty mainstream ideas.