I agree, but if at the end of this I can get them to reconsider their position I'll consider it a win. Different strategies work on different people, some genuinely learn after being called out on their bullshit aggressively, others need a gentle hand, I figure if I stick with being patient and others less so the net has fewer holes.
Edit: looks like it worked out this time, at least to a degree.
Re: "tankies"
I support AES, like the overwhelming majority of Marxist-Leninists, who in turn make up the overwhelming majority of Marxists, to begin with. I don't know what you mean by "full-throated." Do you mean I am loudly supportive, or uncritically supportive? If it's the former, I should hope so! A better world is possible! I refuse to cede ground to those whose stances align more with bourgeois narratives about AES states than proletarian narratives.
If it's the latter, then I disagree vehemontly. Criticism and self-criticism are core principles of Marxism-Leninism. The CPC, the largest Marxist-Leninist party in the world at ~96 million members, paints both Stalin and Mao at "70% good, 30% bad." That's hardly uncritical support. What is opposed is dogmatic rejection of socialist leaders. Critique based on dogma cedes the narrative to the bourgeoisie.
As far as examples, I already noted early Cuba's homophobia, the same applies to the Soviet Union (though some areas like the GDR became more progressive over time, and the USSR in general was extremely progressive from a feminist point of view compared to its peers), and the PRC as well, as an example. Socially, the PRC is behind Cuba and Vietnam, despite having a better economic model. Things are improving steadily, but they have a long way to go.
Does that satisfy, or are you just going to endlessly move the goalposts?
Re: "authoritarianism"
Marxist-Leninists are anti-authoritarian too. Hear it straight from Lenin:
Since all states are authoritarian, we need to abolish the state. But, we can only do that once class ceases to exist, and we can only do so once everyone's social relation to production is interchangeable and the same, ie a classless society based on collectivization. The goal of socialism is to accomplish this, and until all property is sublimated there will be class, and as such until then the state will remain, as it must.
If you're actively inquiring into socialist thought, then you owe it to yourself to explore Marxism-Leninism. It's the most significant and largest branch of Marxism, which in turn is the most significant and largest umbrella under the "socialist" banner. Here's an introductory ML reading list I made, check it out if you wish. If you're "anti-authoritarian," then you should explore what that actually means, beyond just supporting systems when they aren't in crisis and going back on that when they are (see the Nazi Germany vs. Modern Germany example for what I mean, both are equally "authoritarian" in that their class structure is the same but the extent of oppression was based on circumstance)
Re: Critique
I don't purely trust data from AES, I trust data that has significant historical evidence. This is hard to prove without specific examples, but in absence of that, here's my critique of the Gang of Four period of the PRC:
That should cover it, I think?