Actually, I think ideally - I would have done that first video in the headmasters office and then told her that if she brought up her sister or her family's business to me again in any way, ever, that I'd release the video.
It's very possible, if anytime, as you said, that people reply with a similar comment, that they just might be on to something hm? The fact that you have enough data points to show that both, people always say that and that you keep writing comments that get those reactions, speaks volumes about your own character development, or lack there of.