How different are things for a married couple that's never had kids?

This might sound mean, but I’m a single mom (one kid) who had coupled friends with no kids. Sure they have more money, more time, like I get why people choose not to have kids, but also, kids help you grow in ways only kids and heavy responsibility can. They complain more about things they could change but won’t. They can’t handle many inconveniences. And the reason I stopped hanging around childless people, they treat your kid like shit.

Like I said, people don’t want kids, cool, but being a dick to kids, what an evolutionary setback.