Probably because calling Xi Jinping a tyrant is entirely un-Marxist. And I assume this is at least a Anarchocommunist community that agrees in some part with marxism and not some bourgeois ancap subreddit.
You're obviously allowed to critique anyone you want, but calling him a tyrant is just laughably dogmatic. For all its flaws, the CPC's leadership over the State does not operate that way.
Source on him using his supposed "dictatorial powers" to suppress and censor this meme?
Source on it being compulsory education?
Incredulous claims require sources to be taken seriously.