TBH, I wouldn't really recommend telling anyone. I've told a couple of my friends and it's not really helped. Unless they're studied extensively into AS and aren't influenced by the media(in terms of it's coverage on AS).
You have to asked yourself what you'd gain out of them knowing. Thew few friends I have told aren't more tolerant in regards to humouring my sensory issues, think I'm deliberately being awkward when I don't understand social concepts, etc. since I told them, they just sometimes patronise me and condescend a lot.
I personally try not to be judgemental because I know how it feels, but a couple of years ago if someone told me they had some sort of disorder, for example, a form of psychosis, I'd treat them differently. Not to be mean, but simply because I wouldn't have been presented with a similar issues(esp. in High School) and thus wouldn't have been able to know how to handle the situation.
The worse thing that happened was when a lot of people found out because I made a podcast about it(long story about how they found the podcast, but I was hardly telling everyone), and people started asking me loads of questions, and there'd be people who'd watched a documentary about some really random condition like ADHD and ask me if that's what I had, etc.
You have to be very careful to know if the few people you do tell you can trust. I thought I could trust one person, but she actually went around telling quite a lot of people

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EMZ=]