Well no or, maybe he does, but you can't infer that from this. What he is referring to is the tendency of little girls to like, OMG, get super excited and make squeally noises.
As a parent of both sexes and having refereed birthday parties for both I can safely say that his analogy was fair and wouldn't have worked if he had said "little boy". Of course, if he had run around the meeting room, screaming at the top of his lungs, trying to break furniture, then he had indeed picked the wrong gender.
That said it could be an artifact of a time where it was acceptable to say that kind of stuff. Like watching old movies reading old articles can be a bit jarring at times. But getting upset with someone for posting it to support a point is unfair.
How is the idea that women are "more emotional" than men "more neutral" than the idea that "women are weaker than men".
Assuming that your question is meant in good faith, here's an example. I have two sons. One is extremely emotional, far more so than his brother was at that age. He cries over minor incidents, take small slights to heart, gets upset easily, etc. His teacher describes him as "feeling things very deeply."
However, he is also extremely bright and very strong willed. Even at a young age, we can already see that he is not the type of person who will allow himself to be taken advantage of. Despite his sometimes irritating emotionality, there is simply no way I could ever characterize him as weak.
Does that help?
I mean, the whole post (excluding quoted material used to show what that post was responding to) was (including the incorrect use of a period where a question mark was intended):
How is the idea that women are "more emotional" than men "more neutral" than the idea that "women are weaker than men".
To your point, this isn't from 1950 or even 1975. It's recent.
I'm not saying it wasn't a sexist comment or that if it was that Joel has changed. But I'm willing to give him the benefit of the doubt.
Doesn't change it's effects.
Why not like a little boy? Because Joel thinks women are weaker then men, obviously.