Imagine how bad the temper tantrum was that even the threat of an audio recording (not visual) was enough to scare SM into immediately forcing Irene to apologize. Most likely she was coming off as borderline unhinged in it.
It's one thing to read about someone losing it and going on a tirade. Putting it on speaker for the entire world to hear, for all the poor souls who endure that kind of verbal abuse day in and day out at home, at work, at school, to hear full force and relive those terrible moments... Irene is lucky. Very very lucky.