I was d/x with Autism, but not Asperger's. I have an obsessive compulsion of touching my afro to the point of 'needing' medication. Obsessive-compulsions are common in ASD. Perhaps we're 'stimming'. People stim in different ways. There are autistics that are fascinated by hugs and the pressure of heavy blankets (like me). I would say hypersensitivity touch may also be a bit less common since autistics in general are prone to self-harm. Not saying that you harm yourself, but do you get what I'm saying?
A person who is over-sensitive to touch would least likely harm themselves, and most likely to hate any kind of touch. But since a lot of autistics are not that, your constant hair pulling could stem from your obsessive-compulsion, which stems from autism. Autism affects people in different ways, so avoiding touch is also an autistic characteristic, since autism does heighten hearing, visual, or touch sensitivities.