I hit both ends of the scale quite extremely.
It depends whether the other person has been granted the "Contact License" or not.... i.e. the permission to make skin-contact on the condition that I'm aware of it beforehand.
People without the contact license, it is an absolute no-no for. Heck, even through clothing it bugs me. I have to put up with people on the bus who sprawl sometimes, and I avoid sitting next to anyone who takes up too much space. If they push their luck then I get increasingly aggressive and tense, usually sticking my elbows out (I'm very boney, so my elbows are SHARP) and digging them into peoples' sides in return if they don't quit it.
People unlicensed reaching out to me will tend either to be dodged or deflected reflexively. I can just about tolerate handshakes IF I do it with the back of my hand (I can turn my hand inside-out, due to being double-jointed) so as to make them at least as uncomfortable and awkward as it makes me. Any other hand-reachy is totally off-limits though. I will parry or swerve out of the way of oncoming hands and go instantly on the defensive.
With the contact license though... granted only to a few VERY select people (not including family any more, oddly enough). I am the TOTAL opposite. I well tend to go into feline attention-seeker mode at the drop of the hat... hug them spontaneously, nuzzle them, jump in their lap and go to sleep... even quite randomly engage in tickling them. And for that matter I'm mostly ok with them doing anything similar to me, provided I'm not concentrating on something and KNOW they're there. Heck, sometimes I'll meow at them just to get affection (and I really do mean meow), and I've even been known to do it in public.
That said... every time someone has tried touching me like that when I'm NOT aware of it... Well, my ex-wife tried to hug me from behind a few times (I'd have figured once would be enough to learn the lesson) when I didn't know she was there.... and my elbows both shot back like a bear-trap closing on her ribcage and gave her a couple of nasty bruises.
She was annoyed at me, but I felt that, being entirely reflexive on my part, she had nobody to blame but herself.
One other random thing though.
There was another Aspergian guy I used to meet at GameSoc... and I found I could manipulate him into doing things by poking him until he agreed to it. I'm sure he resented me for it, but I knew JUST how to annoy him to get what I wanted. Nobody else understood it.
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