Well, I'm not sure if I'm going to make sense with what I'm about to say, but I hope that I do.

I think that the key word for these and many other situations is "ego". As far as I've seen in some cases, I have reached the conclusion that good values like chivalry are reserved for "friendzoned" guys and girls (this term is more used for guys, but I believe it applies for both, nonetheless). What I've seen is that some people are just attracted to people with greater ego than theirs. Is like, the bigger the ego, the harder it will be to "win" me and the "more" I deserve for being such an attractive (high-ego) person.

Now, whenever there are people who, instead of ego, develop qualities that are important, like respect, chivalry, consideration, and things like that, they usually are answered with: "You're nice, but...", "You're not my type...", and others like this. Plus, since the stereotypes for attractiveness are very influenced by the media, many people prefer looks over values.

Now, speaking a bit about that situation, my opinion is that, whenever someone approaches X person, and is not "worthy" of becoming a potential partner, that person brands him/her with the sign of disapproval and thus, he/she is "allowed" to disrespect said person because, again, that person is not on his/her league (kinda similar to rich vs poor people, and similar stereotypes, don't you think?)

Finally, I believe that is not only disgusting, but also harmful for both parties. One end tries to be a good person, only to realize that "good guys usually don't win" (Kinda remembering The Mask on this one) and the other end will meet the day when he/she will realize that the ego made him/her lose things that truly matter in life.

Anyway, I'm usually naive with these topics, since I lack experience, but I kinda wanted to share my two cents. I just hope that I made sense, though.