It's the mainstream left you have a problem with, and I agree with you. The Democrats like to harp on about LGBT rights, and the rights of people of color, and don't get me wrong, they're important topics, but most of the time, they forget about people with mental disabilities like autism.
At least they aren't actively malicious to anyone who doesn't share their race, gender, or views, like conservatives are. I've seen many a conservative on the internet post ridiculous "memes" about how completely evil the left is, that the fact that people think the left do that kind of thing more is utterly ridiculous to me.
Conservatives might not care, but that isn't a good thing. You might be attracted to the sense of order and routine you might find in conservatism, but I'm willing to bet that the majority of them wouldn't accept you, instead seeing your autism as a dangerous deviance from their law and order, just like the way they see non-traditional gender roles, identities and other races.
The left has always been about the rights of the disadvantaged in our society, it's just that the mainstream has co-opted it to prevent people from being radicalized towards the left, and actually posing a threat to the rich elite and the status quo. Let's bring back the true left, and its support for not only LGBT rights, and the rights of people of color, but for the rights of people with mental disabilities, and the rights of workers - and I don't just mean a higher minimum wage.