What in the world

I'm so fed up with these cranky old people. A customer asked me where something was. So out of habit, I lifted my hand to point. He jumps back. I was confused because there's a good distance between us. He said I wasn't nice and to watch my hand.... I said "sir, all I was doing was pointing you in the right direction." Of course I got stuck ringing him up later. He flinched every time I gestured.