What is wrong with your point is something that is becoming more and more obvious in today's society. Not everyone is alike. Not everyone needs to be alike, identical, fit in. Yet, that is what is pushed by the socialization club; people need to "fit in." Fitting in with "everyone" is conforming to the currently accepted norm, which is usually not healthy.
Like JenB said, homeschooling provides children with real world skills and the ability to fit in at day to date activities: the grocery store, preferred social groups.
I encourage my children to not fit in as much as possible, to be unique, and to be strong in their beliefs.
Some degree of conformity is necessity for a society to function. We have customs, manners, and the like, and problems arise when people do not share these. In these areas, there is no reason not to conform to societal standards, and for a person to successfully function in society, he or she must observe many of them. However, there are other areas where conformity is not the preferred path. Clearly, when it would involve something immoral or unwise, it is totally reasonable to refuse to conform. Part of growing up is learning the former, and part of maturity is learning the latter. Clearly, public schools provide far from an optimal balance (emphasizing the former--with mixed success, but totally neglecting the latter), and home schoolers should be able to do much better, but they need to be careful not to go too far in the opposite direction.