Isolating kids is bad, but modern schools are a very weird, artificial (and often unpleasant) social environment. Many of the social skills you learn in them are useless or even harmful:
It's not. Don't trust someone with no relevant knowledge about the world telling you that the only place he has experience with is exceptional compared to the rest of the world.
http://www.paulgraham.com/nerds.html
Also, homeschooling doesn't mean you can only learn from your parents. You can use any other resource that's available to you.