Edit for clarity: I'm not asking why the Tankie/Anarchist grudge exist. I'm curious about what information sources - mentors, friends, books, TV, cultural osmosis, conveys that information to people. Where do individuals encounter this information and how does it become important to them. It's an anthropology question about a contemporary culture rather than a question about the history of leftism.
I've been thinking about this a bit lately. Newly minted Anarchists have to learn to hate Lenin and Stalin and whoever else they have a grudge against. They have to encounter some materials or teacher who teaches them "Yeah these guys, you have to hate these guys and it has to be super-personal like they kicked your dog. You have to be extremely angry about it and treat anyone who doesn't disavow them as though they're literally going to kill you."
Like there's some process of enculturation there, of being brought in to the culture of anarchism, and there's a process where anarchists learn this thing that all (most?) anarchists know and agree on.
Idk, just anthropology brain anthropologying. Cause like if someone or something didn't teach you this why would you care so much?
For sure. And I don't mean to paint all anarchists with the same brush, since there are genuine anarchists as well as people who use the label anarchist and who even believe themselves to be anarchists, but who I think we would all here would agree are just radlibs at best. But even drawing on my own experience as my leftism developed (which it still is), it wasn't like a conscious "I want to impress liberals" thought process, but more like wanting people to know that I was aware of the "evils of authoritarianism" and that being a leftist and anticapitalist didn't require a submission to "authoritarian" doctrine. I imagine I'm not the only one who felt that way, and even though I know better now, I can still see it sometimes in other people who call themselves anarchists, people who correctly recognize liberals as the common enemy of all leftists, but who still are careful to avoid being associated with "tankies."