the balance between the level of attractiveness and the level of asshole-ness. In short, the hotter you are the more tolerable and common dick-like behavior is. However, there are exceptions. Specifically those who seem to have a distorted self image and think they are the shit when in reality they simply look like shit. Lower levels of attractiveness can be compensated with: good sense of humor, intelligence, or kindness. But the ratio must remain balanced.
John does not adhere to The Ratio, he's fat and ugly and yet he continues to act like a douchebag. He is upsetting the ratio and is thus disgustingly unattractive.