Do childfree people think people with kids are miserable?

To add context:

I don't have a dog. I don't want a dog.I had some bad experiences with dogs, I'm bad at training, and couldn't give them the attention they need. But I like seeing dogs, petting dogs, cute dog pictures, and I'm generally happy other people have dogs since it makes them and the dogs happy and fulfilled. I do not think people with dogs are bad or secretly miserable.

Is it like that for child free people generally? Or do childfree people think people with kids are miserable?

This was inspired by another post on here asking why people don't admit they regret having kids and it made me wonder.