I'd say just leave it alone.
I don't think it's "safe" to try to diagnose other people, nor do I think it would be polite.
I know that if one of my coworkers came up to me and said, "hey, are you an aspie?" I'd be very unhappy. I'd be humiliated that although I thought I was passing for normal (or at least eccentric) that my weirdness was pronounced enough to diagnose.
There's a couple of people where I work who I think have aspie traits, but I'd never say anything to them. I doubt it would help them, and I'm sure it wouldn't do me any good.
One of them I get along with, as well as I get along with any of my coworkers, we have enough interests in common that we can have a conversation, but not a long one.
The other one I really dislike. He's just too extreme in his traits.
The funny thing is that, in terms of getting along at work, I think I'm more adaptive than they are and better at "pretending to be normal", but I wonder if people think I'm just as weird or weirder and talk about me behind my back the way they talk about them. Something to think about.
Grey
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Doesn't play well with others.