The 'nice guy' tag is left as a consolation prize for those useless bastards whose only redeeming quality is their niceness. These guys can't make women feel special (apart from being an emotional tampon), don't have the confidence or style to show that they're able and talented, and don't have any touch of charm or wit. In short, they can't really compete with other men because they're too hesitant and insecure.
Thus, they deliberately pander to attractive women whom they put on a pedestal, not out of genuine concern for women as friends, but because they secretly want some, and this is the only way in which they can really try and get some.
But women can smell this, so they tag them as nice guys: the perfect friends, and the worst of all possible lovers (serial killers aside).
Woman 1's friends all giggle in shared understanding.
The nice guy will eventually realize that his dependability and empathy will never be appreciated and all his friendships with females are all one-sided long before he realizes that putting up the effort to deal with a shallow, materialistic bitch is worth even so much as one ounce of his time and energy. After rejecting the nice guy, the girl will never even think about dating a nice guy in the future, which in turn will make the every other nice guy on the planet feel even more depressed because they all devote so much time and energy to being exactly what many other shallow, materialistic bitches know how to avoid men who are warped from being exposed to rejection they'll never understand to the point that he will either live the rest of his life alone in a tiny apartment, jerking off to old Saved by the Bell episodes or get drunk one night and impregnate a 300-pound, cross-eyed derelict who works at Wendy’s and spend the rest of his life being treated like shit.
The whole ‘nice guy’ phenomenon really supports the idea that nice guys primarily notice the physical appearances of other men and become insanely jealous to the point where they believe shrewdness, selfishness and narcissism will always triumph over compassion, rapport and “inner beauty” because they never realize they are driving these women straight into the arms of these assholes, usually because they don't understand that always being nice makes every nice act completely meaningless and disgenuine for a woman because that's all they do 24/7.
"Well, if you need me I'll be at home, crying myself to sleep while masturbating to the sound of my 70-year-old neighbors having sex while playing some ps2 because all I know how to do is be a sickly sweet doormat and feel sorry for myself. Please love me with your pity."
In the dating pool. Some guys discovered they can come on too hard and be rejected, so they decided that if they become 'nice' and act friendly to the girl, she would grow to trust him and later allow him to take her. Even if she wasn't looking for a relationship or already has someone. Unfortunately, once he realises, the guy becomes resentful and views her as a slut for sleeping with one person she's committed to, or stupid enough to date a bad boy (note that any male that already claims his girl, regardless of look, criminal history (existing or nonexisting), or personality, will be the 'asshole').
Thus, they are people who always whine to themselves (at forums, to each other, or a hapless victim) wondering why, as they're such a 'Nice Guy'. It's become a word that's taken an ironic meaning.
2. An annoying self-designated third-wheeler who puts an unhealthy interest in a couple's relationship, but won't talk to or socialise with girl's own boyfriend. But will completely slam her to friends the minute he realises that she won't cheat/dump boyfriend, let alone do the 'pity-fuck' for him regardless if she feels chemically attracted to him or not. Thus causing a whole line of insults to be written about her online.
Steve: "Dude, he skulks around her like a vulture. You're gonna need to break it to her later."
Many of the other definitions were written by "Nice Guys".
They think they're entitled to sex just because they hold open a door once in a while. They're unsure of themselves to the point they can't manage a declarative sentence. They think strumming guitar makes them deep and they can't understand why it hasn't turned them into a pussy magnet. They are, almost without fail, sexist but tell themselves they're not because, of course, they're a Nice Guy. They tell themselves "nice guys don't get ahead" as an excuse for their own failings. They wrongly believe that women only like jerks, and are deeply bitter about it.
Most women do not like jerks. Women really do like nice guys. But a nice guy is NOT the dude playing gentleman so he can be rewarded with head. The real nice guys -the ones women really do want to date and fuck -are the ones who are genuinely decent human beings. Guys who make a point of calling themselves Nice Guys do not generally fall under this category. And they wonder why they aren't getting any ladies?
So, you fucking internet whiners, how about instead of pissing and moaning about how women never see what a great fella you are and take your pants off all because you took them shopping (you charmer, you!) you actually put some effort into being a real, live nice person instead of a Nice Guy (TM) ?