The greatest irony of all, IMHO, about "mass schooling" versus "homeschooled"? Homeschooled children are introduced to the concept of individual rights and responsibilities right from the get go. Whereas in pub ed, there's this trippy idea that somehow they are going to be working and living within the same "age group" as themselves, all their lives. I think this is why many HS graduates suddenly freak out after HS graduation -- they are introduced to a much larger world comprised of an infinite variety of variables in those around themselves.
On the other hand you do seem to know hwat I was talking about. What was the 'say what?' referring to?
You are exactly right. Despite the social "gaps", home-schooled kids are frequently better mannered and make better eye-contact.
A little anecdote: We carpooled to swim practice with several families whose children attend public school. The other kids only started saying "Thanks for the ride" after hearing my children say it to their parents for about six months. (My kids attend private school.)