Same here, same here. Aspie traits don't come out of nowhere. My kid most definitely got this from me, I have no doubt. Her sensory issues are mine, but multiplied 5 or 10 times.
I actually don't care much for Penny, myself. She's not my type. And, though we're talking about a fictional character here, I know that the Pennys of the world don't much care for me, either.
There are levels of oddness, and there are some oddities, quirks, that can be better hidden and controlled than others. I am, for instance, both shy/anxious and very friendly and chatty (it's possible, yes), but despite this, I only really make true and satisfying friendships with people who are also odd. Not bizarre, not bad or dishonest, of course, just odd, like the world wasn't quite meant for them.
We know things about ourselves, or can intuit how we may be coming across to people, by their reactions to us. This may seem like an obvious thing to say, but I don't think neural-typicals know this sense of never really knowing how a social exchange is going to unfold--all that uncertainty about whether you're being understood, whether you're understanding, and where the sense of alienation comes from when it does come. Not quite knowing the sources of the social elements that seem to promote disconnection, rather than connection. I think this is especially true if nothing about your oddness really "shows." It's worse actually, because socially, no adjustments are made by the typical person, no judgements are suspended. Not sure if I'm being clear, but that's the best I can do right now.
Yes, I could see Arias passing for normal in this way. And, she did make many mentions of her spaciness and clumsiness and attention deficits. Maybe 2Hip is onto something with the idea of autistic traits bordering on personality disordered traits. Maybe Jodi's social orientation was/is aspie, but she was able to, for whatever reason, handle this without the social anxiety and existential angst that is typical for socially odd people. Maybe because her of her "wiring" or whatever it may be, turning off empathy helped her, at least temporarily, to cope and enjoy social success, at least on the surface. Or, I may be mangling what 2Hip was trying to say ...