Except for their genitals, I don't know what immutable differences exist between men and women. Perhaps there are some other unchangeable differences; probably there are a number of irrelevant differences. But it is clear that until social expectations for men and women are equal, until we provide equal respect for both sexes, answers to this question will simply reflect our prejudices.
A typical minority group stereotype -- woman as nigger -- if she knows her place (home), she is really a quite lovable, loving creature, happy and childlike.