Memes

Not really, no. To a capitalist, all forms of leftism is 'authoritarian,' because they consider private property natural and oppose leftists 'stealing' in.

'Authoritarianism' just isn't a particularly useful term because nobody who uses is is ever actually categorically opposed to forcefully compelling people to do or not do things. They will always have a build in exception for what ever they consider to be 'legitimate authority', and what they consider justified authority will just depend on what political philosophy they ascribe to. So really calling the word just means "someone with a different political theory to me with regards to legitimate authority."

I believe in reclaiming "tankie" in the same way as "queer." Schoolyard bullies don't really care to distinguish between the many different labels encompassed by LGBT+, and so they inadvertently invented a term that could be very inclusive and all encompassing, even if you're still figuring out who you are, you call always fall back on "queer" to give the general idea.

In the same way, the term "tankie" gets applied to people of all sorts of different left ideologies. There are significant differences between different leftist ideologies, but our critics don't care to understand or distinguish between them, so I consider tankie to be a similarly inclusive term. Do you support anything that any socialist government has ever done? Do you think Cuba had an effective literacy program? Congratulations, you're a tankie, welcome to the club.

Note that my identifying with the term isn't really an invitation for people to use it. But, you know, if people want to keep using it as this broad, meaningless term that lumps a bunch of people together, as I see it, it only works to our advantage as "tankies," it pushes people towards us and helps us remember what we have in common instead of fighting over our differences. So I'm not exactly going to fight the label particularly hard.

A tankie is anyone to the left of whoever is using the pejorative. Usually because they expressed a critique of imperialism or aren't sufficiently racist towards the Chinese.

generally it vaguely means "communists" as well as "anti-imperialists", with the caveat that left communists are excluded as a separate thing

Tankie always meant a fan of authoritarianism but not of the nazi variety. And hand to hand with that goes hate for America, but hate for America isn't enough on it's own, it should be paired with love of Strong Hand Of The East.
Tankie thinks China, Russia, North Korea are just swell, and not because of some underlying ideology, but because they have an authoritarian model of governance and generally in opposition to the west to some degree.
And that's the reason why it's so hard to define for some people, boiled down to it's definition, it's very hard to spin into something universally good, so talking to a general public they have to do what authoritarian lovers from the other side of the spectrum call "hiding the power lever", which muddies the watter.