In general I don’t care. I too have come to realize that I’m autistic. It’s a shame that I didn’t understand this until my 40’s.

I have found though that I will care if it’s a topic I am also interested in. Babies don’t interest me, and in fact annoy me. So that one is out. Most life events, don’t care.

Vacation stuff? Ok now I’m listening because I do like to travel and I may learn something. Wanna discuss engineering? We could go for hours.

I guess the threshold is, will I get anything out of this conversation? Which, maybe is selfish, maybe it’s autism, I donno. I’m happy that you’re happy about the thing but if I’m being honest with myself I don’t care unless it effects me.

That’s specific to the topics OP is describing and not all conversations. If someone is in need of guidance of something I’m happy to share my knowledge. I am fortunately not a narcissist.