Meaning of "Nickname mismatch"

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Nik-Haeng-Bul-Il

Nickname mismatch닉행불일#SNS#혐오#밈/유행어2010s Meme

mocking the contradiction that arises when a person’s online handle doesn’t match their actual behavior

"His nickname is "King of Kindness," but since he always starts by swearing, people started saying he’s all talk and no action."