I can not conceive of a worse way to teach a kid how to behave in Adult social settings than to throw them into a group of other kids who have just as little experience as they do and then expect the group to "figure it out". This is not to say that there aren't some homeschooling parents who practice a form of extreme isolation which produces what I would regard as an equally bad outcome as public school. But by the numbers from people who have studied this the evidence indicates homeschooling produces the best outcomes for social adjustment in Adulthood.

Probably because well run homeschooling groups tend to have high parental involvement which means the child learns how to socialize not from other children but from watching how the adults they are around handle interactions.

[Edited for clarity in some sentences]