I met a long-time couple recently, and I frequently heard the wife calling her husband Mensch.
As an example, at one point she asked
Was ist das, Mensch?
and at another
Ach, Du Mensch!
It was said in an exasperated, yet still clearly affectionate, manner.
(I’d seen it translated in other contexts — e.g., in a libretto for Alban Berg’s Wozzeck — as an insult; hence my confusion as to what the word means.)