She tried vegetarianism. It got her sick. (Same here, actually, despite using all the right supplements. And especially now that I have a muscle condition that makes me need either meat or meat-derived supplements in order to not go completely floppy really easily. I hate most meat but I need it.) Lots of humans are omnivores, some of us obligate omnivores. Deal with it.
I don't like her views on those she views as "low functioning", "ret*d", or Williams syndrome. I like some of her other stuff. I can identify with some of her experiences but not others, and of all the autistic people writing about their experiences she is relatively far from people I identify with. (Not that that affects how I feel about her, it's fine for people to be very different from me, it doesn't mean they're "misrepresenting autism" any more than I misrepresent autism by discussing my own experiences which are fairly out of the ordinary.)
She's also a human being. If being on television and other media taught me one thing, it's that when people think of you as 'famous' (even the '15 minutes' variety I had), they believe they know you better than they do, when they barely know you at all, and they think they can have an 'opinion on you', discuss you at length with other people who think they know all about you but don't, pronounce a judgment on you-as-a-whole, and that this doesn't affect you in any way. She is several orders of magnitude more famous than I'll ever be, and the fact is that despite reading all her books, I don't know her much at all. I've never met her. Most of who she is, I will never know. That's important to keep in mind when evaluating people from a distance.
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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