Albetta said:
Yep. I put girls in them all the time.
Yep, this.
And in my much younger days, I was in it too.
I have a theory about it; it's TV and Hollywood's fault.
Men are now taught that if you want to be the perfect boyfriend, all you need to do is be her friend. Doesn't matter if she rejects you, doesn't matter if she has a boyfriend, doesn't matter if she says no. Look at any and every Rom-Com or Romantic movie. He hangs around, he keeps helping her, he keeps being nice. It starts from Disney and works all the way through to the Hunger Games or Twilight.
It's also on T.V; Ted was friends with Robin, Barney was friends with Robin, Ross was friends with Rachel, J.D. was friends with Elliot, Leonard was friends with Penny, etc. The running theme was all they had to do was be nice, be supportive, let her walk over them and eventually she'll realise how nice you are and come running.
So nowadays, boys look at this and think "Oh, is this how you get girls? Because I sure as hell don't understand them."
They don't understand when they're rejected, that's probably it. They think "No, I really like her, all I have to do is not give up!" like TV and movies has taught them time and time again.
The anger comes when they realise that people really don't work this way, and they feel like they've been tricked, when they've only really been lied to by the media; the poor girl did nothing wrong, and the guy simply wasn't taught better.
That's my theory, anyway.