@Rikaria
Asian school have many, many rules compared to American or European school.
Like, in my country there are even these rule where boy have to cut their hair short and girl can't have their hair longer than x (ear, shoulder, cm, depends on what rule school goes by).
That's in addition to the other (pretty much pointless) rules such as have to come school before 7.30 to stand in line to "pay your respect to national flag" or boy uniform having to wear sock that is not too short (at their ankle) or too long (at their knee).
Yeah, it's pretty tame in manga from my view that I didn't even notice what is too much rule you talking about.