a) People will not want to acknowledge just how oppressive, racist, and sexist, our society has been in the past and the demonstrable ways in which we are still dealing with the aftereffects of that.
b) People will not want to acknowledge that there is systemic sexism and racism, with extremely negative and unjust consequences for those discriminated against, within our society, and that consequentially ....
c) People will not want to acknowledge that there is systemic sexism & racism within business, including tech, with negative and unjust consequences for those discriminated against, particularly, and relevant to this article, women.
Think that it wasn't until 1919 that women got the right to vote; it wasn't that long ago. It's logical to extrapolate from the sexism of the past that there is sexism (not as pernicious but still here in a big way) in the present.