What better term do you think there is for those who don't want and don't have children?
I consider myself childfree. I don't see it as a celebratory buzz word. It's just what I am.
Those who want children but can't have them usually use the term childless. Semantics are really important. I write alot about this.
Childless is offensive to those who are childfree, as we aren't lacking anything, we are not missing anything. Childfree is offensive to the childless. We all have our preferred choice of language.