Manipulation... ♥

So I'm listening to Wale's "The Manipulation" {a track from The Mixtape About Nothing} and it made me wonder...why are there so many women who settle for men talking to them any ol' kind of way? If you've never heard the song, it's kind of an alter-ego set-up with two separate beats. Against one beat, Wale raps from the point of view of a sweet, considerate, well-mannered guy. Then the beat switches and you have the other guy who calls women b*tches and h*es, and basically demeans them. The moral is that women have a choice of which type of guy we respond to, and I completely agree. 
There's nothing I hate more than hearing a female talk about how disrespected they felt when a dude approached them with "Yo b*tch, you got a man?" or "Damn girl, you got a fat a*s...what I gotta do to hop on that?!"...then a week later, the two of them are dating. What makes certain women respond to these approaches? I've discussed this with female friends before, and one common thing was that back in, say, high school, it was the 'thing' to approach girls like this. So the girls thought guys who stepped to them this way were cool. I don't remember ever thinking that was cute...lol. Apparently at some point, girls let this become "cool", so more guys started doing it. 
When did disrespectful guys become the default, making well-mannered ones the exception? Would you notice the quiet, mellow, respectful guy first at a club/mall/party? Or would you notice the loud, obnoxious, rude one? Which would you prefer to approach/be approached by?
x0x0 ♥