It's a useful shorthand to assert that there are four basic emotions: anger, joy, fear and sadness.
Men are typically criticized for not being more in touch with their feelings. But this really is code, for expressing fear and sadness. Something women are much more like to do.
If men prefer anger and joy, both of which are expansive and powerful feelings, and generally avoid the diminishing experiences of fear and sadness, --or at least keep it to themselves most of the time--what is so hard to understand about that?