I suspect that fingernails on chalkboards, for example, annoy me just as much as they annoy anyone else. Please understand that I'm not just annoyed by certain sounds. Many years later, my daughter sent me a link to an article in the New York Times about misophonia, along with this message: 'You have this.' She was right. Since then, I've picked up several other sounds that drive me crazy, like whistling, slurping, gum snapping, and the sound of magazine pages turning.
I began reacting very strongly to my brother's sniffling when I was ten or eleven.