Where I live, it doesn't matter if you tell people or not. The end result is the same. They can see what you do and how you are and that's it. To them it matters not why you are the way you are, just that you are that way. If I made a big deal out of having AS they would use it as a "distancing label" it wouldn't matter much to them.
It depends on what kind of place you live in and the overall mindset of the population. Some places are more open minded, while others everything that impedes or causes disruptive behaviour or what looks like disruptive behaviour is villified. We have people yelling on the news that if everyone were allowed to be more abusive society would be much healthier, there would be less crime, we would all be soooo much happier which, to me, doesn't make any sense. More abuse equals a better society? That's the mindset here. When you have something like AS, especially if you are a young person diagnosed with it, or ADHD, how can you possibly develop healthy coping strategies and ways of thinking in such and environment, the one that promotes the idea that disruptive behaviour or different ways of being are why society is terrible and why everyone must become more abusive in order to correct it? Why would someone want to freely discuss anything that makes them a bit different, ADHD, ADD, AS, BPD or anything else?
It depends on where you live and the overall cultural mindset. If it is open and not incredibly negative it's so much easier to discuss AS but in places where everything but "quiet and still" is labeled bad discussing AS isn't an easy thing to do.