Perm Banned for this

My friend recently got banned for saying 'S T F U' and everybody else in his team said stuff Like F u c k and nibba And he gets perm banned and they don't get punished. I watched a video that said that K Y S; And N ibba; Triggers the bot the most, how are they not banned and he is, in my opinion, Stfu is not a word that should get him banned.
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