You’re still making it a bit too easy for you. “Not caring about other people’s feelings” is very close to “Not able to understand why somebody reacts and feels a certain way” but is definitely not the same thing.
I’m a parent to (at least one diagnosed so far) autistic child and there are plenty of situations in which this very kind, friendly and empathic person is simply unable to understand why one of the other siblings reacted as they did. Has nothing to do with whether they care or not.
Absolutely. Part of masking is to emulate behavior you’ve observed even though you don’t understand it.
The child in question often need us parents to point out what happened and then they’re able to say the correct things. What I meant was that it’s not obvious to them that someone got offended - at all - to begin with.