Why do people say a person will change their mind or regret their decision not to have kids?

I’m just saying, I’ve seen plenty of people who are happy and don’t regret their decision to not have kids. Just because you want kids or regretted your decision, that doesn’t mean everyone will. Now stop telling people they will change their mind or regret it. It’s just disrespectful. I feel like you’re basically telling them that they’re so stupid that they can’t form their own views and opinion and only your way is the right way. You’re talking down to them about a personal choice that doesn’t effect you.