There are some subtleties in dealing with the fairer sex such as different kind of encouragement, read between the line when they say they are tired, making sure that their understanding is correct etc...
That kind of generalization is exactly what can torpedo your career. Try putting those thoughts about the fairer sex in a memo or blog post and see what response you get.
Just an example,if a male coworker said he is tired and he needs to take a leave, I can ask what's wrong and arrange for longer leave if needed. For the other sex, better ask no questions.
But then I live in Asia, things might be different than in America/Europe.
Given that our shared culture seems quite committed to labeling all men as "unfair", I'd think that the converse description "the fairer sex" is only... well, fair, y'know.
Maybe, but English is not my native language so it doesn't matter here.
Fun fact: The word for 'woman' in my country is derived from '婦' - 女 (“woman”) + 帚 (“broom”), so even calling them that way is kinda male chauvinist already.