Overdone with the scar and humiliation thing
I don't buy for a second that kids would publicly humiliate a person just because half her face is filled with scars. She doesn't even have any deformation. That was really unrealistic and overly fake-shocking moment. Not mentioning the stupid part where "Monster" was scarred next to her door. When i was in middle school kids laughed when someone wore glasses, when someone wore funny clothes (for their age, that is), but never when something serious was troubling someone.
I've never experienced nor heard of any situation like this before in real life. At least here in first world part kids tend to have some discretion. My brother's 12-year-old friend has only one hand, and all his classmates are friends with him. No one humiliating nor making fun of him. Though i could imagine being one-handed could bring more humiliation. But yeah, that's Finland for you.
So overdone by the director...