I have actually found the “tankie” moniker to be useful IRL:
Tell someone you’re a Marxist-Leninist and you just get a blank stare.
Tell someone you’re a socialist and they think you mean you’re simpatico with AOC and Bernie.
Tell someone you’re a communist and they will just shut down and not hear anything else you say.
But “tankie” seems to convey enough truth - that you support past and current efforts from AES states to build socialism - to be useful.