“What is it that makes people think it’s their place to comment on how/what you should do with your kids when your kids are welll-behaved and you are double their age or have double the life experience?”
Human nature is if they aren’t divorced, they think they are better than you and know more than you. You can’t let them have that misconception.
Also, after reading your little convo between you and your friend, if your friend isn’t a snob, it could be they thought you were seeking their advice. “Me:So my daughter came to visit…” ie -What do you have to say about it? If you don’t want their unsolicited advice try this – My daughter’s visit was nice and I enjoyed it -I’m hoping to see her again in the not so distant future. Make sure your comments aren’t open -ended, so the other person won’t think you want their opinion. Starting the convo with “so” can give the impression of seeking advice. If for some reason, you do it the way I say and still they put their two cents in, simply and curtly say -I’m really not seeking opinions on this. Or if you want to be mean say -I’m not interested in Your opinion -keep it to yourself!