I added Japanese subtitles on a brilliant animation video explains about autism - there's English (and other) subs as well so you don't need to be Japanese to watch it!
This video doesn't say everything, there are a lot more that need to be known and understood about autism, but I think it'll help if adults recognise that it's not craziness or rudeness, neither bad parenting, so that little people, or other big people, would know that their little friends are as sweet as themselves.