No one whom I see on a regular basis is like that. But I had a similar experience in September while checking out after a doctor appointment. This person's disinterest in social engagement was obvious. It was as if there was a contest to see how few words were needed to schedule a follow up appointment. I was handed the appointment card without fanfare and greeted with silence when I said "Thank you" and "Have a nice day." Just nothing. Not even sullenness, really. Just nothing.
When I leave work at the end of the day, I do not say good-bye to my computer or cubicle. So I wonder if these people regard patients and clients as just another tool, piece of furniture or other inanimate object they encounter throughout the day.