I have never really understood how a whole fully grown man would let his underpants hang out for the rest of the world to see! Honestly no one wants to know what you are wearing underneath your clothes. It is completely and utterly disrespectful and disgusting.
Who said sagging was fashionable? I know trends come and go back this is one which needs to be hauled into the bottomless pit because it is an insult by those who claim it to be a fashion statement. What statement are you trying to make?