What is the psychology that boys like to bully girls?

Boys always bully girls in the following ways:

First, boys are too young to understand. Especially in the stage before the emergence of male secondary sexual characteristics, boys basically like to bully girls, and some boys even fight with girls. Because the concept of men and women was not strong at that time, boys still didn't know how to let girls go.

I remember when I was in primary school, there was a boy in my class who especially liked to bully girls. He often quarrels with girls and sometimes gestures with them with a broom. But I don't know when that boy stopped bullying girls. Every time a girl "duels" with him, he tries to avoid it, and also uses "good men don't fight with women" to resolve the embarrassment.

Second, this boy is very ungentlemanly and always seeks happiness from bullying girls. Some boys, even if they are sensible, don't know how to "cherish love and cherish jade" and take pleasure in bullying girls.

This reminds me of one of my former classmates. When I think of him, I feel like having a nightmare. Although I have never been bullied by him, it really hurts to see those girls being bullied by him.

Maybe the pressure of the college entrance examination is too great. That boy often knocks around with a stool scale. Sometimes, I don't know whether he intentionally or unintentionally, the stool scale will fall on a girl's arm and make a terrible scream.

Because he didn't hit me like that, I don't know if it hurts, but I'm scared when I see him, and I have a psychological shadow.

Finally, of course, boys like girls, so they will bully him. Some boys, facing the girls they like, will be at a loss and make some bullying behaviors, mainly to attract the attention of girls.

Of course, this boy must be bullying a girl, not all girls. If this is the case, it is very likely that boys have a good impression on girls.