I heard some buddies calling a mutual acquaintance of ours creepy. Very interested, I asked why they thought that way, and they described what is essentially a description of flat affect. I had my suspicions, but this was a very illuminating look into the NT mind and explains so much.
It's interesting that drug users, psychopaths, schizophrenics, and individuals on SSRI's (who are prone to violence) all demonstrate flat affect as a symptom. So it's no wonder that NT's are conditioned by Evolution to shun a person with flat affect. Such people are, quite often, irrational, crazy, violent, and dangerous.
This is not the case for autistics. Autistics are less likely to commit violent crimes than almost anyone else. But, unfortunately, some of us are prone to being caught in the cross-fire of a well-placed Evolutionary survival trait.
I just thought the comments of these NT's was insightful. My cousin who has Schizophrenia has flat affect. And this explains why NT's think that some of us are "high" or have mental disorders.