He wasn't dealing with the real world when he was in school, he was withdrawing. Yes, the social aspect of school is important too and she took that into account, she just had more control of the children he associated with. Church, family, neighborhood friends and she eventually put him in a private school, but in the meantime, he didn't get behind in his schooling.
Back in the day, the only kids that were homeschooled were religious freaks and anarchists hiding behind barbed wire fences... oh, and kids who were too sick to go to school, but they got tutors from the school system. But that's not the case anymore. There are lots of people homeschooling their children because they aren't happy with the public schools. And it's happening more and more with "no child left behind." because the kids who traditionally got a good education from public school are getting left out, left behind and held back with NCLB so that it gives the appearance of the other catching up.
There are lots of homeschool networking groups. CSM offers supplemental classes for topics where parents might not have the skills or resources to do it themselves. Places like dance and gymnastics studios have classes catering to homeschoolers so that the children have interaction with their peers and also get some physical education instruction. There are lots of social opportunities for homeschooled children.