Hēi fěn

Synonyms:	anti-fan, hater
See also:	anti-fandom, Cyberbullying in Fandom
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Hēi fěn 黑粉 is a mainland Chinese internet term for a hater or anti-fan (literally "black fan"). This term is used to describe people who attack or spread malicious gossip about celebrities they hate.

English-language discussions among fans of Chinese media referring to "antis" are likely referring to this type of fan, either the Chinese-speaking hei fen themselves, or English-speaking fans behaving the same way.