I think some degree of grouping exists but I went to a kinda fucked up school so there was lots of drug consumption, fights, bullies and so on. I noticed a lot of groups in both genders and even subgroups, it's not a myth though it may not be like in the movies.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you