Child free groups are like mens rights groups, nobody is getting in your way, you can cry and act judged all you want but you're fine.
But yeah, r/childfree seems to be mostly about people complaining about how hard they have it by not having kids, how disgusting other people's kids are, etc. It's a big ol' echo chamber. They're welcome to it, but it's not exactly a support group so much as a shared bitching session.
For one example, let's look at one of the top posts right now, featuring two siblings who go to their mom's house and jump down each others' throat; the child-free sibling didn't like booger-talk at the dinner table, so retaliated by rubbing the fact that the childful (is that a term?) sibling can't go on an upcoming cruise: https://www.reddit.com/r/childfree/comments/5mr7nw/rant_my_s...
If someone doesn't want to have children, they shouldn't catch any additional shit for it, but they're not exactly some elevated saint either.
I'm cool with people not having children but that sub/movement seems mainly full of selfish materialistic people.
Maybe we should just stop doing that so much in general?
So it goes both ways. Like with many movements, it probably started out with pure intentions and a legitimate grievance, but then it became tribal like every other facet of human society.
As biological organisms, our sole purpose is to reproduce. Our minds are designed around a lifecycle that includes having children and grandchildren. Betting that forgoing these will make for a happier life seems like a terrible wager.
I've heard enough "I pay exorbitant amounts of child support but can't see my kids" horror stories to ensure that I will never have children in a western country.