DD is 9 and seems wonderfully oblivious to any differences in people. A couple of examples - her friend at school has selective mutism, she’s never spoken to my daughter, DD has never shown any interest in asking me why.
We attend a playgroup with her and my younger son (who is awaiting an autism assessment). A lot of the kids there have high support needs as it is for autistic children. She has never wondered why we go to a playgroup with disabled children. My son has low support needs so not obvious we are there for him.
I guess I’m wondering whether most children are still oblivious to differences between themselves and others at this age and I guess I’m also wondering whether this could be a sign of autism and a general lack of interest / awareness of others.