[revelio]

It's because the education system is systematically biased against males and they pick up on this, correctly perceiving education as a system run by sexists that will penalize them for their gender and which doesn't really want them there.

Anti-male hiring bias in academia:

https://news.ycombinator.com/item?id=35762380

Grading biases in high school:

https://mitili.mit.edu/sites/default/files/project-documents...

I use a combination of blind and non-blind test scores to show that middle school teachers favor girls when they grade. This favoritism, estimated in the form of individual teacher effects, has long-term consequences: as measured by their national evaluations three years later, male students make less progress than their female counterparts. Gender-biased grading accounts for 21 percent of boys falling behind girls in math during middle school. On the other hand, girls who benefit from gender bias in math are more likely to select a science track in high school.

This is a problem with society but especially amongst liberals, who dominate the education system. Your own comments display very clear and strong anti-male bias, ascribing the issue to parents being indulgent (!), boys uncontrolled aggression being the problem, the media, that men don't apply themselves ... any explanation except the obvious one that teachers aren't treating people fairly.