Women age 15-30/35: Guys go crazy for them. They're hot, got curves, good skin, tight body, perkiness, and so forth. They have incredibly low self esteem, so they keep themselves feeling good about themselves by getting approval by attractive, high-status men.
What happens when they can no longer get this confidence boost? That would suck, wouldn't it.
Women age 30/35+: Don't have the youth they used to have. Men are no longer falling over for them. They cannot seduce a man based on their sex appeal and appearance. A girl who is worth little in the personality/intelligence department will end up unable to hold the interest of a decent man. She'll look for attention elsewhere. She'll find men who will give her attention even though she is nothing more than an aging *****. These are the niceguys (not nice guys, niceguys), betas, softies, and AFCs.
Of course the age given is BS. There's no "Age" limit to this transformation. As long as a woman can hold the interest of hot, awesome, cool guys, she'll take advantage of the amazing feeling it gives her. Being able to sleep with awesome guys makes her feel better about herself because her self-esteem is based on NOTHING MORE than how hot she is to hot guys.
Naturally, when that's no longer possible, she'll lower her standards in order to continue getting that flimsy confidence boost from attracting and hooking in a male - this time, a guy with low standards as well.
When a woman depends on men for confidence, and the man doesn't do what the woman wants her to do (thus denying her that CRUCIAL confidence boost), it's easy to hate cool high-status men as a result.
Story of America.