I say that I have autism. For the past year, that was met with an expression of appreciating interest. Acquaintances usually go "ah, so that's why you..." and that's it. Talk about unexciting. You would think that with how some people treat the topic of autism like something meant for secrecy, reactions to saying you have autism would tend to be me... anything, really. Louder. More elaborate. Thrilling.
On the occasions at which I did say that I have Asperger's, friends reacted with vehement denial after they read up on it and insisted that I was "nothing like that". I was at a loss about how to react for a moment. That issue was solved when I did say that it means that I have autism, they read up on (classical) autism and then they were just okay with it, treating my autism like just another normal part of me.
If I use the word "Asperger's" it's way too often followed by a doubtful exclamation of "but you don't have/do..." which is ridiculously annoying. If I say autism then the follow up is either a curious question about autism or a statement similar to "so that's why...".
Then of course there are a few people who react with rudeness to either, claiming ASDs don't exist, that ASDs are something else or that I'm not autistic but "ret*d" and/or "insecure and pretend to be impaired".
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett