Nobody's ever asked.
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Okay, fine, I'll make my post longer.
None of my peers at school ever suspected that I had a specific condition, much less Asperger's, although that's probably because most of them had never heard of it. The one person who did notice that I had AS was a support teacher who was used to working with pupils with learning difficulties and special needs.
I was always the quiet one, the walking dictionary, the one who smiles all the time, the brainy one, the teacher's son, the eccentric, the maths wizz (haha) and so on. Since I had a reputation of being eccentric, I was never afraid to do quirky things so this reinforced the fact that I was, let's say, unusual.
I didn't talk a great deal at school, but I was never completely isolated. Also, I don't stim noticeably in front of other people, and my eye contact isn't bad, so even if my friends did know what AS was, they might not have picked it up. They'd have just put me down as 'quiet, brainy and weird.'
I did have one friend who was also diagnosed with AS, but he never knew I had it until I told him.
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"Never try to teach a pig to sing. It wastes your time and annoys the pig."