I really like the book "I am an aspie girl" there are some good ideas in there, I guess I would keep the terminology fairly simple and then use lots of examples of how someone with autism might react in a certain scenario and why and how people can help them when this happens. I would also speak about it in terms of a difference of variation and speak of it in terms of something like being blind which alters the persons life and requires some accommodations and support but is not an illness or disease.
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"I will file you under "L" for people I love most. "