A lot of awkward homeschooled kids are homeschooled because they're awkward.

Mainstream schools spat them out.

Quite a few didn't play well - cheating, temper tantrums & such. The HS kids sorted it out themselves as the parents tended to keep their distance during social/play meetings. HS kids have a pretty strong sense of fairness & while they were tolerant, they didn't put up with shit behaviour.