I've had a revelation. (I'm sure I'm just coming to it more slowly than to some of you, though.)
These leftists have realized that we live in a truly equal society (or at least as close as you can get) where every person, regardless of gender or race, has equal opportunity for advancement based on their own talents and skills.
The will never say that is the case, but they know it to be true.
I can say this because the OP's type of rationalization (Science, logic, evidence, is RACIST and SEXIST!) is necessary for these people to explain why certain professions and industries have a greater prevalence (or absence) of one sex or race only if it is not due to "you are racistly oppressingly discriminatingly against <black people, brown people, women, etc...>
I realize not all leftists have given up the "WE LIVE IN THE WORSTEST, MOST RASISTIST SOCIETY IN TEH HISTORY OF TEH WORLD, PRECIOUS!!!" but those who are pushing the "logic is racist" theory must have realized that personal racism must be all but dead.