植野:ちょっとからかってた的な…ことはあったかも
将也:まあ一応。僕もやめとけとは言ったんですけどね。聞かなかったし
石田:お前も一緒にやってたじゃん!女子なんてすげぇ悪口言ってたでしょ。ねえ!特に(植野)と(川井)が
川井:ひどい…。私そんなことしないよ。どうして…。石田くんひどいよ
Everyone's putting the blame on 石田 for bullying.
I would expect maybe しなかった to mean "No, I didn't do that". What does しない mean here? To me this seems like it would mean "I'm not going to do such things (making fun/teasing, etc.)" but that makes little sense to me, as they're talking about something that happened.
Is there something to しない that implies the past?