What "Nice Guys" fail to realize, every time, is that there is a huge, HUGE difference between being a nice person and being a "polite" person.
Being polite is easy as shit, once you know the expected social graces. The beauty of politeness is that it's easy to fake. It allows our society to continue to function in spite of our own nature. This is easily identifiable in the world of business, for example. You take two CEOs of major companies. They hate each others guts. But, because their companies can work together, they maintain a polite, amicable relationship with each other. Doesn't change the fact that they masturbate to the thought of stabbing the other guy every night.
Politeness also works to cover up a bad personality. And it is fairly effective. Here's where the Nice Guys fall down. For one, they're not actually nice people. So it is 100% a facade. And two, they are not only horny as hell, they're also just as impatient, if not more.
So when a girl isn't impressed by their Nice Guy persona, they drop the pretense almost immediately and unleash their true, venomous selves.
"What do you mean you won't go out on a date with me?! I held the door open for you, like, every day for two weeks! Why can't you just give a nice guy like me a chance! I bet you're just going to go home to your thug boyfriend who smacks you around every night! Whatever, you aren't worth a guy like me anyway, you fat pig! .....

Why am I so alone?"