Humility in Grimms' Fairy Tales is a lot like pie: it's impossible to have too much of it. You can, however, have too little of it. Having too little pie will just make you sad, but having too little humility will make you dead. Or people will take it upon themselves to teach you a lesson, which will probably make you wish you were dead. There's also a gendered dimension to humility in the tales; it's adorably surprising when boys are humble and naïve, but it's essential for girls to be humble, or else.
Humility is distributed more by social class than by gender.
Humble characters are boring characters.