What ever happened to being simply polite, and thinking about people before you lash out? Hell; you should even be polite, and keep the tone civil if you hate t

What ever happened to being simply polite, and thinking about people before you lash out? Hell; you should even be polite, and keep the tone civil if you hate the person at the receiving end. I think, to an extent, this is what's gone wrong with online communication and political discourse - when did civility become something we simply wear when it's convenient?