If you don't have an opinion on it, you might when you learn the fascists were putting chalk marks on the doors of communists and jews

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.