|Or does he think they are going to gradually become weird, from being with their parents... the same parents who have not made them weird so far?
Exactly. If he feels the refreshing normalcy of the school system is all that has prevented you sucking your children into a dark morass of weird, doesn't your family have bigger problems to worry about?
I was homeschooled (and public schooled and private schooled, actually, but HSed for the last few years of school), and I'm certainly no poster child for normal. But if we can divide the "weird" into categories:
1. Slightly Aspie. Genetic, as far as they know. Not the fault of homeschooling.
2. Interested in arcane topics. I don't think this is a bad thing at all. Having specialised niches of knowledge (as long as they are combined with bigger-picture stuff, not zeroed in on to a complete exclusion of the way the rest of the world works) is a good way to become an expert in your field and end up in a job you love. I remember being interested in arcane topics before I was homeschooled, so it didn't cause it, but it did give me more time to indulge my passion in those topics (Tolkien and cooking are the two that spring to mind from that era).
3. Some non-mainstream political/religious/philosophical/medical views. The same could probably be said for most people on MDC.
Not caused by homeschooling per se - Mum didn't sit us down and teach us about Weston A Price or child-led weaning - but caused by the kinds of people my parents are, and by my tendencies to research and to apply formal logic to arguments.
4. Slight tendency to depression (never to the point of requiring medication). Triggered by the suicide of a friend at 16, plus my family is riddled with it. Some phobias, triggered by watching Free Willy
at a tender age and an unpleasant experience in an antique shop as a small child. Neither caused by homeschooling.
5. Non-mainstream tastes in music, clothing, design etc. To be honest, homeschooling probably fostered this a bit. But retro's in right now, so... woot? Plus, the lack of TV and my interest in history - neither of which were homeschooling-related - probably contributed just as much.
So... you see the problem? It would be easy to look at me and go "Oh well, she was homeschooled
", but that wouldn't plumb the depths of my weirdness.
And I bet most "weird" people have similarly tortuous explanations for their different facets of weirdness, not all of which involve the way they were educated.