Yes, sad to say, I've seen this on the internet in general also. I look at other sites and forum boards and it actually seems to be the latest "trend" in insults. I've seen trolls use it lately like it's the worst thing you could say to hurt someone. It's pathetic. But the people who are using this are just ignorant jerks who don't know anything about it. Try not to get rattled; they're idiots and not worth it.
(I typed this three minutes ago and keep trying to post this and it keeps saying there's a new reply! Lemme post my post!

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I thought maybe it has something to do with groups like Autism Speaks painting Autism as one of the worse things you could have. Some people even support the group! So maybe that's where some of it is coming from.