Not sure yet what this "tankie" thing is about... It seems to be an american thing, and as far as I understand it is used to disqualify anyone not aligned with social democrat point of view (ie western world is the good ones, despite what the 70 last years show us, capitalism is the least worst system, and societal liberalism is a huge enough concession to leftism). Or am I wrong ?
"Tankie" refers to the kinds of people who like Soviet and Chinese style oligarchies because they paint themselves red. Often, these people are in opposition to all Western countries, and social democrats in particular, whom they think of as 'social fascists' and, in many cases, oppose social democrats more than actual right-wing opposition.
Tankies were originally members of the Communist Party of Great Britain who were in favour of Soviet tanks mowing down first Hungarian and secondly Czechoslovakian ( as they were then ) protesters. These days it’s used as a pejorative towards anyone who has a good thing to say about communism / socialism etc.
It generally a tankie is someone who rejects facts in favor of beliefs. That is often communism related but I have also seen liberal people who also tend to fall into that category.
It’s almost like there are people blinded by messianic fervour on both (all) parts of the political spectrum. Who’d’ve thunk it? Humans be deeply flawed creatures - but I love them all. (Apart from actual arm band wearing Nazis.)