I have two hypotheses; first, most of my social-interaction-hours growing up were spent with adults. As a result I got (I think) very good at impressing adults, but pretty much didn't understand my peers at all.

Ooh, I hadn't though of that one.

I wouldn't trust homeschoolers themselves to be rational about this. It's also worth noting that homeschooling is not terribly unified, my experience may have been atypical. Second hypothesis is that I started life out with -3 S.D. social skills and public school wouldn't change that.

On the one hand, I don't think these were conducted by homeshoolers or based on surveys.

On the other hand, I only think that this is supported by studies because a homeschooling-related website told me so, while I was looking for material to support my argument regarding a specific individual (who I'm pretty sure was at -1 S.D and wasn't likely to improve in public school.) I hadn't seen anything to contradict it till your comment, and it seemed like it should have a fairly high prior, so...