I don't really get my information from anything other than observation of the social dynamics of autistic people when they get together both online and offline. I've been involved in autistic communities for a little over ten years so I've had a lot to watch.
But if you want examples of hierarchies, you need look no further than some posts here, where people talk as if aspies are better than auties, HFA is better than LFA, diagnosed is better than self-diagnosed, etc. (And some other people occasionally make the opposite hierarchies.)
One thing that I've noticed is that a lot of autistic people expect that when they do these things, it'll be obvious and with intent to do them. It isn't. So then they do them without noticing, and then think they aren't doing them because they haven't noticed or specifically intended to do them.
I think that comes from a lifetime of not learning the lessons that most nonautistic people learn early in childhood from regular social exposure. We generally get that kind of social exposure later if at all, and then we think we're categorically different so those things won't happen or apply. Except we're not, and they do apply.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams