It's kind of ridiculous that my therapist sometimes looks up if I see her in the building or outside and sometimes acts like she doesn't know me, because she has no waiting room and I am a sitting duck outside her office as people walk by, look at me, look at the sign on her door and once I even had my picture taken accidentally when I left an appointment in tears and walked into a wedding procession outside her office. So I really don't understand this business of not letting people know we know each other. I have also had people stop and talk to me until she opens her door. I am numb to it and don't care. It's just interesting to me that this (not acknowledging unless the client acknowledges) is a thing.