I think that I do. Again, this is so hard to tell, unless you actually spend some time and talk to the person. Additionally, when I'm out in public, the last thing I want to notice is OTHER PEOPLE...
Anyways, I seem to notice probable aspies in grocery stores, for some reason.
There's a bag-boy who works at one that I frequent, and he refuses to make eye-contact with anyone, seldom speaks except for the topic of beverages, and is rigid and mechanical in his movements. Could be an aspie.
One time I was in a check-out line at a different grocery store, and the guy behind me reminded me of myself, except he was middle-aged. He was dressed formally in a casual sort of way, he had his mp3 player with headphones, darkened glasses, and seemed to be overwhelmed with anxiety. I mean, that's what I do at stores. I find the whole experience drastically more manageable if I've got headphones and sunglasses, and I go during uncrowded times. Otherwise I'm a ball of scattered nerves and sensory overload. This random guy looked like he was going through the same thing that I do.
I often wonder how autistic I look to other people! Particularly when I'm in stores, wearing my headphones and sunglasses, muttering about how f*cking crowded it is, oafishly pacing around in a strange sort of way, recoiling if I get too near people or am spoken to. Me and the public world don't mix too well.
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Plantae/Magnoliophyta/Magnoliopsida/Fabales/Fabaceae/Mimosoideae/Acacia