I have felt like that. When I was a child.

And you totally can opt out. You can go live in a mud hut in the woods. People do it all the time. But we both know that's not what the original commenter means by "opting out of society". They mean "I want to opt out of contributing to society while somehow still enjoying its benefits". Sorry, but it just doesn't work that way, and it is indeed childish to think that it should, at least as long as those benefits come from the contributions of other people.