Ah, this again.
There's quite a different between a guy who happens to be nice, and a Nice Guy.
There's a certain kind of guy that is convinced that the universe owes him an adoring woman or three because he's a Nice Guy, who will tell you at great length about how much he worships women, except any he's actually met, who are all bitches and whores because they aren't convinced by his awesome Nice Guy-ness. For some reason, these people tend to be single. Funny that.
You also get guys who are nice, because they think it's the right way to be, which isn't the same thing at all.
Being nice (or, more likely, loudly claiming to be nice) in order to impress girls...that just doesn't work, it's not what being nice is about at all.