I can't say I noticed anything either way tbh, most people know DS has Asperger's, I mean I don't tell people at bus stops or anything, lol, but if I know someone well enough to be talking about my kids then they know. Though I think people are just in general more accepting of differences if they know there's a reason for them.
I suppose I could have not told some of the people that know, close friends and family it would have been difficult not to tell and anyone who's had to look after him needs to know...but he knows and is quite open about it, so I never really saw any point in not mentioning it - I wouldn't want him to think there was any need to not tell anyone, to be embarrassed by it, so, yeah most people I know, know.
I'd rather people knew he has AS than to judge him on things he doesn't choose to do - if you see what I mean.
I've also found that the older he is the harder it would be to hide anyway - the things that weren't noticeable in a small child tend to raise eyebrows in a 14 yr old.
DP had a harder time with it, he didn't want him 'labelled', for a long time we argued about it - he said I should just accept DS as he was and stop trying to pick faults with him, then it was a case of - well ok he's not an exactly a typical wee boy, but what does it matter?
He was worried about people knowing, but, I think he genuinely though DS would grow out of it.