Anyone who just ignores people a lot? As in the sense of:
not deliberately avoiding and shutting out the other's approaches because one does not know how to answer, is annoyed by it or dislikes the person, but just because it's unimportant, hard to pay attention to, hard to remember to socialise?
For example, when out with friends I ignore just do not listen or answer to people whom my friends meet or who join out group because they're friends of my friends. I just treat them as if they were not there, until maybe if I remember that I should talk to them. Generally, strangers nether bother me, I do not acknowledge their presence. (Edit: I know what all they're doing, what all they're saying, I automatically notice, but it feels like watching the landscape or gaping at animals at the zoo.)
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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