I know what you mean but it’s hard to talk about these things without generalizing, since we can’t ask everyone on the planet how they feel.
It’s super easy actually! You just qualify your statements. For example:
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I don’t like how some people…
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I’ve noticed that a lot of people…
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There’s quite a few people that…
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The majority of people seem to…
This language avoid assumptions about how everyone else feels and leaves the reader an out to say to themselves, “I’m not in that group and they acknowledge that I am an exception.” It avoids the trap of over generalization and doesn’t put the reader on the defensive. Language like “all people” and “allistic people” (meaning all non-autistic people) only work to alienate. Ironically it demonstrates the same behavior they appear to be complaining about…