Earlier quoted context omitted.
Is the reason it's sexist because it can be interpreted as "women are less capable than men"? You would say this other statement is false and sexist, correct?
Human discourse does not consist of people stating neutral, truthful propositions in isolation. We are not Vulcans. When someone chooses to say a particular sentence is as much a part of communication as what that sentence says. So when someone says "very few women are capable of running a Fortune 500 company effectively," they aren't merely blurting out a fact at random, they are trying to say something . And depend…
Yay.
But also ... there's a sort of idiot's veto over language. If people who are racist say "X", and I also say "X", does that make me racist? Well, no. But as a participant in a society, as a participant in a conversation, I need to be aware of the context. If racist people are saying "X", I should probably take advantage of the insane level of linguistic flexibility in most human languages and find a different way to make the point I was trying to make.
Some will protest that this "capitulation" ("I refuse to stop saying X just some bad people are saying it too") allows the bad people to control our language. I say that if you're not a bad person (whatever that might mean), you can almost certainly find alternative ways of speaking that avoid us wasting time debating whether you're a bad person.