For example, men are much more aggressive, in general, than women, while women tend to be much more nurturing. Men are more individualistic, while women are more social. Men tend to rely more on rational thought, while women rely more on feelings. These observations are generalizations, or course, but they are fairly obvious. You can see these tendencies in children at play.
Girls play with dolls and work with each other socially, while boys wage mock wars with one another.
They are simply different, and they have their own places. For example, you cannot deal socially with a wild tiger who is attacking your village, so an aggressive approach works better. On the other hand, an aggressive approach does not work at all with children. A good book to read for more information is Men Are From Mars, Women Are from Venus by John Gray. See the references section for more information.