At least, he used to pick his nose during commercial breaks. I don’t know if he still does. How do I know? In the 1980’s (in very rural Alabama where there was no other option for TV) my family had a satellite, one of those big-ass ones that look like they could at once connect to the Pentagon and sit a family of nine hot-tub style.
We got the raw feed without commercials; I remember watching the news with my grandfather, just waiting for the commercial break. It was the highlight of watching TV. So yeah, Brokaw picked his nose and Walters cursed like a sailor when they thought no one was watching. The thought of it still makes me happy.