"Tankie" just means communist, though, like "pinko" or "commie." It's a pejorative in the same way "boot" is a pejorative for the police and millitary, it doesn't refer to anything different. Some communists call themselves "tankie" as a tongue-in-cheek joke, but it isn't an actual subcategory of communist.

I do know how to read, and I'm aware of logical fallacies. I don't rely on telling others that they are too stupid to understand my points, because that's a cheap and lazy way to dodge arguments.