There are nice guys, and there are "nice guys".
The latter believe that there are only 2 ways to be male: to be either a "macho man" (misogynistic,
narcissistic, aggressive jerkoff) or a "nice
guy" (misogynistic, narcissistic, passive-aggressive jerkoff, but also manipulative and spineless). They believe that talking to a woman for five seconds without saying "shut up bitch" means that they're a paragon of everything women want and are thus automatically owed pussy. When they're denied it, it's the woman's failing.
Although they see themselves as having no self-esteem, in
reality they actually view themselves as better than "macho men" and when women
reject them clearly
said women have been lying when they say they want a "nice
guy". They thus try and turn into the macho jerks they claim to despise because that's what women "actually want".
Never does it occur to them that 1) they're not actually very nice 2) by and large women
don't want macho jerks, they're just less annoying than "nice guys" 3) there’s a third option: being an ACTUALLY nice
guy. Someone who DOESN'T try and screw with women's heads, someone who has ACTUAL respect for women rather than just tries a different dishonest tactic to get laid, and someone who has the guts to be honest about what they want and the spine to suck it up when they
don't get it rather than whining about how dreadful women are and getting gradually more
bitter and hateful.
Nice
guy: I'm such a nice guy, why
don't girls want me? They say they want nice guys! But they go out with macho jerks! Or they dump me for them! They're all lying
bitches who break your heart!
Actually nice guy: Arrogant, misogynistic, whiny - what woman WOULDN'T want you?