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アンチ anchi
A hater who keeps watching.
What does anchi mean?
From "anti-". Not just someone who dislikes a creator — someone who follows them closely in order to keep criticizing. Labeling a person アンチ ends the conversation fast, so aim carefully.
Example
アンチのコメントは気にしないことにした。
I've decided not to care about the haters' comments.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
Aimed at another person, this is an insult.
The story behind anchi
アンチ came from the prefix anti and hardened into a noun on the message boards of the 2000s, where a popular figure would have both a fan thread and a dedicated アンチスレ running side by side. The word for the opposite pole is 信者, believer, and the old net proverb says the two are separated by a sheet of paper.
Be honest about the damage in both directions. Sustained アンチ activity is not banter; creators have stepped back from public life because of it, and the anonymity that makes Japanese platforms comfortable also makes this cheap. But the label is a blunt instrument too. Call someone アンチ and any real criticism they had just stopped being audible.