As far as nice guys. I dont think all are manipulative. Many are just stupid and dont understand people.
I totally get what AJ is saying, but I've got to agree with mrgoodstuff here.
I'll try to explain the "nice guy" thing a bit more.
1. At first, plenty of nice guys genuinely believe that they are doing the "right thing." They see loud, arrogant jerks being seemingly "disrespectful" of women, and decide to do the opposite. At first, the nice guy really wants to be the gentlemen and be "better" than the jerk.
2. But the nice guy might well be shy/timid/inexperienced, so he plays a more "passive" game* than the jerk. He's very indirect about his intentions and thinks playing a slow, "long game" of being her friend first will work. He somehow believes that being "friends first" will lead to a relationship or at least FWB sex.
3. When he loses the girl, or gets firmly friendzoned, or much worse, finds out that she is sleeping with some jerk, he is obviously not happy about that. Then he thinks of her as a bytch as a sort of defense mechanism. (Or sour grapes or being "butthurt" or call it what you will.)
*The nice guy isn't totally stupid. He's also playing a slow, passive game on purpose because (consciously or unconsciously) he KNOWS that he isn't good looking enough to be direct with women. If he goes direct like the jerk guy, the nice guy is going to be shut down hard or called a creep. So he plays a passive, low-risk, low-stakes game, which isn't too effective either.