How does the author describe the disparity between the treatment of male and female behaviors at a young age in the nonfiction book, Lean In?

The author states: "From a very early age, boys are encouraged to take charge and offer their opinions. Teachers interact more with boys, call on them more frequently, and ask them more questions. Boys are also more likely to call out answers, and when they do, teachers usually listen to them. When girls call out, teachers often scold them for breaking the rules and remind them to raise their hands if they want to speak."