Not so recent, Robert, but getting more common, even as you note, in “educated” people and some TV journalists. [Do you know why everyone uses ‘you know’? Viewpoints, Oct. 7]
My grandparents, used to say when I used that phrase, “If you think we know, then why are you telling us?” Now I am a grandparent and saying the same thing also.
Good observation, I wish I knew why people say that.