All the time. I used to be offended, but then I realized most NT's lie to each other to thier face and that is considered "polite", "socially acceptable" blah blah, blah. What it really means is they are liars, and being honest means youare an as*hole. I'd rather be an as*hole, lying is for insecure people who can't have trouble having an opinion.
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I hate hearing, "you don't seem autistic/aspie". I have a nagging suspicion most people have no idea what autistic or aspie "seem" like in the first place...