There seems to be a person (using multiple accounts, or maybe multiple oddly likeminded people) going through #chibi tag and leaving borderline obsessive comments on random works. They claim that the word "chibi" is offensive and that people should stop using it +

there's a weird rise in bots that try to farm engagement by leaving strange and argumentative comments on random topics. from the behavior described, this sounds like one of those cases. Just block and ignore, it's nonsense written by an AI