IDK about the rest, but I don't find it threatening specifically because your first assumption was false.
I don't shit-talk people, so in your scenario, everyone just gets texts about how I talk them up to others? So suddenly I'm more liked than ever, because suddenly I'm one of the few who isn't an asshole just because I can get away with it, and now everyone knows that... Big whoop.
Is that the kind of discussion you wanted?
On a more serious note, if your scenario actually occurred, I think most people would just shrug and move on. If it happened to just one person, they might be ostracized... But if it's everyone, people are more likely to just forgive and forget because everyone had their "private" thoughts exposed.
Sure, some relationships might be irreparably destroyed... But others might be stronger than ever. Life-shattering social drama happen all the time. But at the end of the day... Everyone still needs to go to work so they can eat and have a home, and companies will still need employees to get shit done.
I don't think it would be too different just because it happened to everyone at the same time.
Compared to that nothingburger, your claims and responses to comments are far more engaging.