I probably should have put a racial exclusion in there too, but obviously you get my point. I'm going to go out on a limb here and guess you're Asian though.
The thing with Louise is that a lot of the way she acts is a front. She's picked on like crazy at school and is generally regarded as a failure.
Deep down she's very sweet and kind, as is demonstrated several times throughout the show. The rough exterior makes her more interesting and works to make the sweet part of her personality have more impact.