I loathe people like this.  As a recipient of "smacks", I can tell you it left me with issues that took years to move past.  I am a firm believer that if you must use violence to solve issues, you have a brain that is incapable of creative thought and you're simply lazy, angry and a blight to society.
  Anyone that "smacks" someone smaller than themselves, without fear of being hit back, is nothing but a spineless coward and should be shot with balls of their own shit for a week.  
  If they're still angry afterward, you haven't shot them with enough shit.