Even though I do not have any experiences of how boys become men because I am not a man, I still know that adults treat boys and girls differently since they are born. For example, if a baby girl dress in pink, people usually says "What a pretty girl" and then hold them very gently. If baby boys dress in blue, they will say "What a strong little boy". Instead of holding them gently, people usually hold a baby boy roughly and move him around. People will still say "What a pretty girl" if the baby boy was dressed in pink. I remember asking one of my four years cousin why he does not pink. We all laugh after he answered with "boys don 't wear pink, only girls wear pink and dress."
Dress differently did not affect boys to become men, but the ways that adults treat boys and girls affected the boys to be rough and girls to be gentle. I still remember I was only allowed to play with dolls and fake cooking materials. I wished to play with all those robots, cars, guns that my younger brother had. Boys are into all those fighting characters like superman, x-men, etc, while girls are forced to be interesting in Barbies and dollhouses. Boys will start fighting each other