“Man’s inhumanity to man”--the phrase is all too familiar. But until Phyllis Chesler's now-classic book, a profound silence prevailed about woman’s inhumanity to woman. Women's aggression may not take the same form as men's, but girls and women are indeed aggressive, often indirectly and mainly toward one another. They judge harshly, hold grudges, gossip, exclude, and disconnect from other women.             Like men, women are exposed to the messages of misogyny and sexism that permeate cultures worldwide. Like men, women unconsciously buy into negative images that can trigger abuse and mistreatment of other women. But like other social victims, many do not realize stereotyping affects members within the victimized group as well as those outside the group.