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The character is scolding her friend けいちゃん because he didn't get picked as a leader, telling him to not get mad. Is it alright to 怒んないの as an imperative here?
強く決めつけて命令する意を表す。「余計なことを言わないの」
,軽く命じるのに使う。「さっさと着替えるの」「強い子は泣かないの」
, japanese.stackexchange.com/a/95984/9831