In my experience* the genuine inquiry is vocalized sightly differently from the throw-away getting, but they definitely both exist. You'll get an odd look givin

In my experience* the genuine inquiry is vocalized sightly differently from the throw-away getting, but they definitely both exist. You'll get an odd look giving a genuine answer to the greeting and incredulity or even be considered rude if you answer the inquiry dismissively. Interpersonal communication is fraught with opportunities for misunderstanding at the best of times. *I've spent all 29 years of my life in the Northeast USA, for context.