> in order to be able to freely choose which group to join, no group must be allowed to reject me.
That's not how free association works. Both the individual and the group, each according to their own criteria, determine if they want to associate with one another.
The same point applies to many of your other arguments.
I don't really think it would increase the number of people who are left behind. There are many left behind people all over the world who on paper have states they belong to, but which the rules of those states leave them cut out of any real participation. If they could participate in whatever groups they currently belong to, with full sovereignty rather than under a state attempting to destroy these groups and subsume them, I think those people would be better off. And, for those few that are unwanted by anyone, much fewer than there are now in a state dominated environment, they can always choose to associate with one another.
There will be rules based on location no matter what you do. You don't need a state for that. People live in places, and they have customs and etiquette and rules of decorum. You probably won't be able to walk around naked in Kabul no matter whether there's a state or not.