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It's not animosity. It's pragmatism. Most people define themselves to be "nice." This can be problematic when it comes to looking at uncomfortable, messy, or ugly sins in our lives. "But I'm a NICE person!" we say. So we advertise as "nice" all the while being unethical. Then other people end up saying things like, "Yeah, the NICE GIRLS all have unrealistic expectations," never bothering to evaluate that just because someone claims nicety doesn't make them good or ethical.
The same is true for all these self-reporting "nice" guys that get left behind. Lots of them aren't particularly nice or ethical. When relationships fall apart because of their lack of ethics or their underlying disdain for women, they don't self-examine and realize, "Wow! I'm really not all that nice." They just keep on telling the same story about how the problem is all these women who chase after bad boys
Here's the reality. If I must choose between a man who proclaims nicety, but who harbors hidden bitterness and meanness and a man who is an "out and proud" chaos guy, I'm going for the chaos guy. You know what you're getting up front, and they're probably a bit more exciting than the "nice" guy who'll spend months criticizing and chipping away at you so you fit some ideal in his head.