The wife of a friend would leave the room if a gun was present. I asked her about it, and she couldn't articulate why, but the sight of a gun just wigged her out.
My former rifle range chairman's wife would get physically ill at the sight of a gun. He worked on her long enough that she actually was shooting a gun at one point. Still not enthusiastic about it though.
So there are folks out there who will freak out at the sight of a gun. I work with a guy who runs screaming like a little girl at the sight of a snake, including fake ones. So who knows.