If I may help - I am not Asperger, but I know several and have worked with them. I am also "on the spectrum", as are a big chunk of my friends and family. Based on these experiences, it is not that others feel threatened. It's just that we don't have very good social graces, and others find that off-putting. But there is some good news, we can get better:

Me: I read "How To Win Friends And Influence People" by Dale Carnegie when I was a teen, and it changed my life.

Other: (laughs) It obviously didn't work because you're terrible at social graces!

Me: Yeah, but you didn't know me before I read that book!

So there is hope, but reading a book won't work miracles. It's a lifelong struggle with me to learn social graces.

A nice side effect of being "on the spectrum" myself is I enjoy working with people like that, including Aspergers, because I understand where their lack of social graces comes from and it doesn't bother me in the least.