For fat people it is. Fat makes you stupid and there for this is a great message superior intelligence.  Also the same reason why they have very wide access to ranch dressing. Can't have two fat tubbies duking it out because one of them was blocking the ranch and wouldn't move (big surprise, lol , wouldn't move). Bitch get outta my way for the ranch!! Reeeee. No other explanation for why ranch is special and gets spaced out wide and all other dressing is single file.