Then the problem is that you're basically saying 'screw you' to a society that invested a lot of time into raising you, feeding you, giving you an education, etc. People have a debt to pay to society, because without society, we'd all be feral animals. There's no such thing as a self made man, you are who you are because of society. Refusing to reciprocate is selfish and disrespectful to all the people who cared about you. Furthermore, by refusing to contribute your abilities back to society, you're hurting all the people whose lives could be made better if you only decided to care.

Now to get back to your example, let's say you run away to the backcountry and produce everything you need yourself without ever interacting with society again. This is even worse, because not only have you taken from society without giving back, you're now recklessly taking from nature. You've carved yourself out a new habitat where you weren't welcome, kicking animals out of their home, skinning them to make your own clothes, polluting their water, etc. And since you're just one person, you're making grossly inefficient use of the resources nature has given you. So much harm just to fulfill a disturbed desire to get away from people.

But this logic isn't black and white. It certainly doesn't apply to indigenous people who were just trying to live their lives until another culture showed up and started ruining everything. There are also some people who belong to groups that are so systematically marginalized, that you simply can't blame them if they want to get away from a society that only seems to hurt them.

You could also use these arguments to scorn people who run away from their home towns to go live in New York City. Yes, that's selfish too in some respects, but they're still giving back to the human race and I don't believe people should be beholden to towns or nations. There needs to be a balance between individual autonomy and the needs of families and communities. I also don't think anyone should put a gun to your head and tell you that you can't live in a log cabin in the woods. But my point is, just because you can do something doesn't mean it's right or that you should.