I’m a tankie. What tankie is supposed to mean is someone who blindly supports anything anyone does so long as they claim to be communist and wave a red flag. There’s maybe a handful of edgy teens who actually fit that description, but the way it’s actually used is to punch left at anyone who supports anything a socialist country has ever done, or who is insufficiently patriotic/nationalistic and is willing to consider things from an internationalist perspective.
If you say for example that Cuba under Castro had a successful literacy program, then there are people who will accuse you of being a tankie just for that. Because it gets used this way, some people like myself chose to reclaim the insult and wear it proudly.
Generally, the actual term for most “tankies” would be Marxist-Leninist. But I actually prefer tankie because it’s a more general, big tent label. It’s used so broadly that even anarchists can be called tankies. It’s basically like “woke” where it doesn’t actually have any real meaning.