Summers hates women, so perhaps this is his way
of getting them back.
Although Summers is out of his league on the issues of tonsillectomies and hysterectomies, I wouldn't go so far as to agree that he "hates women." I'm aware that he was involved in a controversy as the president of Harvard when he spoke about the relatively small numbers of female scientists, or something to that effect, stating (roughly) that gender differences in aptitudes account for that. The unjust flak that he took from the feminists for those remarks led to his resignation from that position, IIRC.