When the attitude posed towards to questions regarding 'who is better at x: men or women?' is the same as the response to 'who is better at x: whites vs blacks' - essentially, the response to both should be: 'WTF, it does NOT matter! If there is a difference, years of oppression probably account for it rather than some inherent biological difference'.
Interesting and important, as the original negative beliefs about women were also applied to black people and other ethnic groups, so to tackle racism, you have to tackle sexism as the root of racism; as women were thought of as a separate species and that was then applied to other races in order to 'feminize' and 'degrade' them.
Without solving sexism, racism and other prejudices will not disappear.