They definitely do if they're adults. Those with AD(H)D too.
Talking to kids about their interests is fun even if I don't care much about blankets, cars, ants or tops. With kids there's more opportunity for the back-and-forth of conversation. (from my autistic perspective) I get to answer, I get to ask questions, I can make a suggestion or just say I'm bored and want to change the subject.
They can't force me to stay on topic and they are fun to engage into something new (even if it's tiny).
With adults I feel it's more repetitive and they don't really care for responses, their sentences are long and the way they present their interest is in a fashion I don't think alike to.
At worst, they (subconsciously) try to force me to stay on topic and they more often resist to be engaged into something else.
Well, the way I see it, this applies to all children and adults. I don't know anyone who isn't like this - in my eyes. It's just that some of those with ASDs and AD(H)D take it beyond that.
I don't think I annoy anyone with my interests.
I don't like talking about what interests me. I don't see the point if someone else is not interested in it too. If someone is, then for the sake of social improvement, I'd rather hear them talking to understand social expectations better.
I suppose my communication style is, if anything, more childlike. I can annoy people a lot, too. A lot. My distractedness is formidable.
People around me usually make a point to just ignore it (for the sake of their sanity) for half a minute or at most a minute until I get back to the conversation by myself.
Not making much sense, but I already got annoyed with HF autistic adults who don't keep to social rules in face to face interactions.
I try not to, but my initial reaction is annoyance about that someone older and less-autistic than me just didn't keep to the social rule I kept to.
It annoys me. But messy people with ADHD (who share my living-space) annoy me too, until a couple of seconds later, I remind myself there's absolutely no point of being annoyed.
So then I learnt to breathe in deep and stop being annoyed, because that way I feel much better.
That all said, I really enjoy working with people with autism and AD(H)D. They're not any more or any less annoying than other people, but interacting with them sure offers a different way of fun than is gained by interacting just with “normal” people.
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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