I don't like touching or being close to other people. Don't even like hugging family. The only exception is my SO, because I know he is gentle and won't do stuff that bothers me. We are also not PDA people at all. We're so no-PDA that there are people that have thought we were brother and sister!

One acquaintance of mine who is also asperger once asked me when we were parting ways, "So do we hug or something?" and neither of us were keen on the idea though it would have been appropriate, so I gave him my fist (neither of us like handshakes either).

Fistbump. The best way to greet IMO. Even cats endorse it.

(But probably not good for job interviews...)