" Therefore, we can safely say that social group plays a very important role in shaping someone's behavior.
If you still think that the fact given above is invalid for it was tested on animal, think about your own experiences. You might have a different approach compared to what your sister or brother got. These approaches come from your social group; it might come from your teacher, neighbor, or even your family. In fact, family, as the smallest unit of society, plays the greatest role in shaping the image of the "ideal" men and women. Parents, realized or not, differentiate the methods of upbringing and raising their son to their daughter. Since they know that they will get a baby boy, they start to paint the baby room with blue color and, later, buy "masculine" type of toys such as robots, car toys, gun toys, etc. They believe that pink is a little too feminine for their son and dolls can make him looks like a sissy. On the other hand, their daughter is disallowed to play with gun toys for it is so-not-a-girl-type-of-toy. To prevent their daughter to play with boys" toys again, they provided her with many "domestic" kinds of toys. Girls get dolls, for their parents want them to be a good mother who would devote her life to nurture their children, and cooking set toy, for the parents hope that their daughters will be able to learn the importance of providing food for her future husband and kids. Furthermore, from their early years, boys are taught not to cry for it is so shameful for boys to cry when girls are allowed to show their emotions. This way, boys cannot show his emotion fully because when they do so, their parents will scold them for being such a spoiled baby. The girls are also taught not to be a naughty girl for "to be naughty means to be a boy". Once the girls do a little mischievous thing, the parents will scold them and make them promise not to do the same thing again.
