Speaking for myself, it's a mix of things: part lack of interest, part sluggish social processing (my mind goes blank even though I'm not anxious), part not knowing I'm expected to show interest.
This bit describes my experiences well (from http://www.dudeimanaspie.com/2011/09/su ... elief.html ):
Quote:
I talked at length about Asperger's one night, over appetizers of smoked salmon and crackers, at a restaurant called Red Sky. Peppered with questions, I was happy to answer. I coined a classic phrase, "more time and data points." But one question surprised me:
"How come you don?t ask us questions about our lives? Is it because you?re not interested?"
Oh! I didn't realize. Of course I am interested in you, I explained. I learn about you by listening, observing, and asking when I feel the time is right. Please don't be offended if I don't ask. And on and on, we continued to learn from each other.