I agree that he was being professional and keeping the focus on you. My T and I both have a child on the autism spectrum. The only reason I know about his son is because my EX-T told me when I let her know I was switching to him for a bit. Which...she really shouldn't have done. It was about a month before I even told T that I knew that because I started feeling awkward talking about things with my D, and T would seem really knowledgeable about fidget toys. T was not too happy that ex-T had said anything--he was of course fine that I told him that I knew. I asked him a single question that he answered--his son's age (he also showed me the picture on his desk). In some ways, I want to know more about his son, like whether he's higher-functioning like my D or lower-functioning. But then I realize that could affect how I talk to him about stuff and would keep the focus from being on me. So I think to myself "he understands from experience" but think it's better to just not know more than that.

Like a couple others on here, I had a T (ex-marriage counselor) who way overdisclosed, and I think it was detrimental to our therapy and greatly intensified my transference for him. I don't think T's should be completely blank slate either, but I think they should think carefully about what they share. I suspect your T didn't want to influence what you were discussing and your own emotional reaction, so he tried to keep his experience out of it. If it's still bothering you, I'd talk to him about your feelings.