Interesting notion, but it seems suspicious to me. I live in a place where when windy the trees make all sorts of loud squeaky noises. I glory in it. But nails on a chalkboard and forks on a plate, even when distant, give me jolts that even a baby shrieking near me doesn't.

Interesting, I heard another theory that it was due to some flying predator during our cave-people days that was our deadliest threat, and evolution baked-in that threat-sense into humans.