I think it's a lot simpler than most people here believe: people in Lemmy love the West and they see tankies as people who hate the West. It's nothing more complicated than that. They do not hate fascists in the same way because fascists do not hate the West.
I think this is a very good insight! It seems anytime I interact with someone who complains about "tankies" it goes one of two ways: either A) they go full
about how West is Best, usually dressed up in Liberalism in a flimsy attempt to hide their racism and chauvinism (which are so intense they leak through anyway), or B) I'm removing B because I don't want to get too into sectarianism, but I'm frustrated that radlibs seem to have been successfully co-opting anarchist terms over the last decade in order to cosplay as radicals while still defending the system that gives them some crumbs of comfort.