If we think broadly about who cares about whom, it goes like this:
* Men care about women because they want to mate with them,
* Women care about women because it's in their own best interest to look after each other (men only care about them for selfish reasons),
* Men don't care about men because it's not in their own best interest to do so, in fact it's advantageous to defeat other men,
* Women don't care about men because it's not in their own best interest to do so.
Essentially, women support each other, men compete with each other.