Typically people that get called tankies defend the USSR, or China, or any other authoritarian socialist government by saying that shit was either completely made up by the west, or say that "the U.S. does it too and worse", or anything else to avoid acknowledging the human rights abuses that have happened under the authoritarian socialist regimes.

You can usually find them here in places like lemmygrad or hexbear. It's a spectrum, some people side with Russia with the Ukraine invasion others think things like the uyghur genocide in Xinjiang is just capitalist propaganda.

Here's a good example of Second Thought doing it, constantly comparing things to what the U.S. does, which obviously are bad but just because the U.S. does it doesn't mean that China can get away with it: https://youtu.be/NhPOrkGbpxk