With respect Wamster, it's coming across as though you are deliberately misunderstanding what others are saying.
Frankly speaking, if a person comes up to me and starts talking, whether their intention is to have sex with me, to sell sign me up with Sky or to kill some time because they are lonely, why is it my responsibility to indulge them, to give them of MY time because it's what THEY want? You seem to be suggesting that women should feel obliged to give their time and attention to men in particular because it's their responsibility to ensure men don't feel upset or rejected.
No one is suggesting that person should be rude to another person for approaching them, whether it's because they want sex, they want a sale or are just bored. What people ARE saying is when encountering men who feel ENTITLED to women's time, attention and quite possibly sex, whether you are friendly, rude, subtle, clear, ignore them or whatever tactic you try, it makes no difference.
Men want to play the hero? C'mon, we're talking real life adult human beings, not comic book characters. Also, do you think folks here care whether men are slagging "us" off on another site? One might be led to question whether your mentioning this may be because you are a member of such a site.