I think its because, to an extent, masculinity has been villainized, and people who are masculine (in appearance, identity or desire to be traditionally masculine) naturally look for people that pretend to value them.

This combined with reduction or even removal of shop classes, reduced PE, recess and physical activities in school, female teachers now far outnumbering male teachers, and strict attitude towards typical male behavior can easily build a huge amount of resentment in young men. Most public schools now are heavily tailored towards female students.

Doing normal boy stuff, like roughing each other up and messing with your friends got me and other boys detention, and it felt extremely unfair.