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.