The difference reside in the ideological structure of the communities in question. One is clearly abble to understand the subtility of the meme because they have the right tool to do so. The other are just douche bag leftists and bourgeois down-voting what they don’t understand.

Left communism, or the communist left, describes a range of positions held by the left wing of communism, which criticises the political ideas and practices held by Marxist–Leninists, Trotskyists, and social democrats. (Here social Democrats includes anarchists as their sub radical fringe.)

Communism never existed, so was never Left. what we have left is the counter revolution in the third International taking grounds at the forth Congress. Left communism as opposed to center and right tendency in the third International.