[irrational]

But, where would you observe it? It isn't the kind of thing people talk about in public, usually. I know my wife and her friends discuss mental health issues, but they have never done so in front of me. Those discussions only happen in private.

The only thing I can figure is that as teenagers girls discuss mental health issues and they learned it from slightly older teenage girls who themselves learned it from their own slightly older teenage girls when they were younger.