Where were you and others encountering these homeschooled kids if they were locked up in their cosseted homes in which they were apparently never socialized?
As another reply pointed out, maybe these kids are “weird” in some way, maybe they are not. We don’t have more than anecdotes here. More importantly, and to the point of my first reply, we don’t know the motives of their parents. The GP was engaged in mind reading. Certainly, the motives are manifold. One motive may be, “I’m going to home school my kid because he’s weird and won’t do well in a public school.” We don’t know which way the causal arrow points.
As another reply pointed out, maybe these kids are “weird” in some way, maybe they are not. We don’t have more than anecdotes here. More importantly, and to the point of my first reply, we don’t know the motives of their parents. The GP was engaged in mind reading. Certainly, the motives are manifold. One motive may be, “I’m going to home school my kid because he’s weird and won’t do well in a public school.” We don’t know which way the causal arrow points.