You say that you have examples of how men and women differ in communication style; I think that what you should do is look over your list, and ask yourself why those things matter in day to day life.
One obvious reason is that most people expect others to think and communicate the way that they themselves do. Consequently, if a man is expressing himself in a "male" way and a woman listening to him is interpreting it in a "female" way, the communication between the two is not going to be effective.
The fact that men and women do communicate differently is becoming increasingly important in the world as gender roles change. More and more women are taking on leadership roles in business and in politics, and it is very important that both genders learn to communicate clearly and accurately to one another.
Another change in gender roles is the fact that more couples are getting divorced. As divorce becomes more common and socially acceptable, will people be more apt to give up on trying to communicate to their spouse and just walk away from the relationship? If so, what impact do you think that has on their children, and on society as a whole?