Are boys and girls so different?
Well, I think, that girls and boys are completely different in childhood. For example, girls play with dolls, game "my family", and they are more accurate than boys. Meanwhile boys play with toy guns, cars and usually they have bad behavior.
But when they grow up - everything changes. Their personality is formed, Therefore, a girl can become a bully, and a boy can be a good student.
So, I can say, that it depends on the time.