If u asked someone if they’ve children and they replied “none of ur business”…how’d u react?

Depends on how they would say it. If they acted overly defensive, I'd go quiet and wouldn't try to initiate any conversation with them any further.
if it was half-jokingly and while laughing I'd shrug, laugh too and switch to another subject.

I’d say sorry for asking but also be confused because it’s just a question

Are they a stranger?

I don’t usually ask people personal questions especially about children what with all the creeps everywhere

Still it’s kinda rude of em 😅 i’d probably be offended

I would say "I'm sorry, I meant no harm." Then walk away shaking my head.

I’d say ok, but u didn’t have to be rude about it.

I would say I thought my son looks just like you

Everyone's entitled to have a bad day.... Just move on...

I'd just say sorry for asking

I guess put off.

I would think that this was a very emotional subject for them, and I would leave it alone.

I wouldn't go asking because it's none of my business.

I’d just move along.

I would accept that its not my business

I would figure they didn't want to talk and walk away.

It's a little hostile for sure.

I never ask. I figure if they wanted me to know they would tell me

https://similarworlds.com/nature-outdoors/5348727-Just-found-my-spirit-animal

I'd respect their answer.