Interesting study from a year or two back:
"Researchers found that, rather than being grateful for the fall-back option, being rejected by an attractive man actually makes a woman more likely to turn down an unattractive one, and to describe him harshly. It is as if distancing herself from the unattractive man helps her retain the idea that she is high status, cushioning the blow of the rejection."
There isn't really much to say about this that isn't already clear. Right now, there's a nice guy out there somewhere, still waiting for his magical oneitis to hit the wall and come running to him (as soon as Chad starts looking for fresher talent). Picture him. After running out of time and options, his oneitis might actually consider our mild-mannered friend, especially if he makes a nice income, but ONLY because she feels that she has to.
You read it in the article. This rejected woman, who is now out of options, isn't simply indifferent to the less attractive man. She is now HOSTILE to him, even if the guy is accepting toward her... just because Chad didn't want her. Her hamster goes insane, trying to shield her ego at all costs and she lashes out at the less attractive man. (And I remind you that these are involuntary, natural reactions wired into women's minds).
If a woman, for any reason, feels that you are not the man... that either she is settling for you or she used to pull more attractive guys than you, then watch out because she might be harboring a deep, instinctual disdain for you. If you feel that you aren't as attractive as you could be, it might not be the best idea to bother trying to pursue any kind of serious relationship because you might end up with a woman that hates you to the core. That is all.