For most clients, I imagine what is actually important is that their therapist appear genuine. That is not the same as be genuine. The persona I present in front of a lecture hall is not quite the same as my real persona, though they are related. But it seems quite genuine to the students.

I am curious as to why the post you responded to is demeaning - i.e., lessens your dignity - to you or any other client. Whether or not your therapist is genuine or just appears so, why is it demeaning to have someone point out the possibility that they are not genuine? It might be demeaning to the therapists, but why would it be demeaning to the client?