Heterosexual males tend to have very strong visual cues for archetypal female forms - not coincidentally the ones associated with fertility and child-rearing - wide birthing hips (which are accentuated by a small waist) and large breasts for nursing.

Meanwhile, heterosexual women tend to be attracted to men who exhibit power, which is associated with the ability to provide for her and her offspring. On a base level that means big muscles and aggressiveness. But women can be and are enculturated to associate that archetypal drive with signs of social power - money, possessions and political status, and to types of "looks" that signal a person likely to be widely accepted in social reality unrelated to his physical abilities. Giving birth is an enormous risky proposition for a human female - both in terms of risks to her own immediate well-being and the commitment of time and resources that will be required of her to sustain her children.

Perhaps a woman is offended when a man lacking the right masculine traits approaches her because it triggers her own insecurities and fears - hence, this response is a defense mechanism. If unattractive males are approaching her, isn't it likely that there will be a feeling that something about her is limiting her ability to attract the kind of mate she needs and a corresponding need to control this self-injurious feeling? While attention from a man that meets her mostly subconscious requirements for a mate reinforces her feelings that she is herself a suitable mate?

QED