>>310999People do that for the same reason a phycho doesn't murder someone in broad daylight with a bunch of witnesses. Unless they're a masochist and like getting caught, or wish to forward some kind of inhumane purview.
People have a public image. They like to keep it consistent under the light of scrutiny, then unveil their true colors under the cover of darkness.
I'm sorry this has happened to you so consitently. Sometimes people suck. But remember that if they are shoving all this hate onto you and acting all hypocritical, they probably feel insecure about themselves. Don't take them too seriously. Rather, fee bad for them that they would willingly choose to act like a spoiled elementary school bully.