I dont understand it either. We can't force them. It has to come from within for them to want to change it for the fact that it bothers you, or you can do it back. 
My father would constantly stare at women around my mother and make certain comments about them. It bothered her, but she learned to fire back LOL. One day, a man was walking down the street and she told my father "He looks like he's packing." My father was so shocked, and he actually stopped doing it LOL. I know it bothered him because he is who told me this story. It may not be the "right" thing to do, but hey it got him to stop.
..::.*Love is giving someone the ability to break your heart but trusting them not to*.::..