The underlying nature of men and women is different in many ways. A good place to start are the physical differences. It has been recently theorized that the hormone prolactin is related to a man's having less access to the use of emotional tears.
Prolactin is a hormone that is instrumental in emotional tear production.
It seems that levels of prolactin drop at about the time a young boy enters adolescence. This physical difference tells us that a man will be less likely to access his tears in grief due in some part to physiological reasons. I can remember the distance I had from emotional tears as an adolescent. I can now understand this in a different way, knowing that a part of that change was probably physiological. This difference can be seen around the world in various cultures and is not limited to North America.