This is the norm for Gen Z. We don’t see it because children don’t set social norms where adults are present too, but with the oldest of Gen Z about to turn 30, you and I should expect to see this more and more, and get used to it. If every kid can handle it, I think we can, too.

Kids also pee in their pants at a rate vastly exceeding that of adults, but they usually stop doing it before they hit 30.

It doesn't change the point of your comment necessarily, but as far as TFA goes, the author was teaching a University course in 2015, so is highly unlikely to be Gen Z.