I don't know what generation you belong to, but I was still in school when mobile phones that could record video became "good enough" that most of my peers in school had them, today I'm ~33. But we were also thinking about that sort of stuff, especially when we were doing stuff you kind of don't want to be public, and there was a few cases of embarrassing things "leaking" which obviously suck.
But I'm not sure how different it is today? Maybe it's more acceptable to film people straight in their faces, and less accepted to slap the phone out of people's hand if they're obnoxious about it? In the end, it doesn't feel like a "new" problem anymore, as it seems like this all started more than 15 years ago and we had fears about being filmed already then.