There's a lot of confirmation bias going on here. How many homeschooled kids with good social skills didn't you notice?
There's also a potential selection bias in that parents maybe be more likely to homeschool kids that have social issues because they have social issues and don't fit in at school.
If there were a lot of homeschooled kids with good social skills I’d still expect to have met some.
Unless you're quite young, it's doubtful that you've interacted with many of these next-gen homeschool kids.
I think it's pretty likely given that statement and the small population of home-schooled kids to begin with, that confirmation bias explains your entire experience.
But let's assume it doesn't. Home-schooled kids who do have good social skills are likely to realize that there is a bias against them and thus they aren't likely to advertise that they were home-schooled.