For me I think it has to be Russiagate. It’s just become a catch all for centrist libs to refuse to believe anything bad about their team, make up crazy conspiracies about anyone to their left or right, dismiss every contradiction of capitalism as “Russian interference”. It’s maddening. At least the RWNJ conspiracies like Q and the Alex Jones shit are usually pretty funny because of how ridiculous they are, russiagate doesn’t even have that going for it.
What are some other contenders?
The term "tankie" is a Boogeyman. To anarchists, all socialists are tankies. To socdems, anarchists are tankies. The Democrats have learned the word tankie and are using it to refer to all leftists.
It doesn't mean anything, it's just a memetic carrier for leftover McCarthyism.