Wow. When I read things like that, I'm so glad I'm autistic (Aspgergers). I treat them all the same. That caused me problems fro a long time, but now I just tell them I have Asperger's, and they adapt.
Interestingly, when people ask me what I think of someone I've just met, my mind goes blank. How am I supposed to know when I haven't asked them a single thing about themselves.That said, it generally takes me about 30 minutes in an interview situation to figures someone out - something I'm very, very good at. I used to be headhunter, and in other capacities, I've interviewewed a lot of people.
You're right that we do sort of people. I definitely do. I sort them into people who can deliver logical, objective, factual information, and those who don't. :)