Maddy can be a brat, and I've been sorry that Kate and Jon haven't required TLC to edit out her bad behavior sometimes. Her classmates probably watch the show, and eventually she'll have to deal with the fact that other kids her age won't like her...
So true, and sometimes a little peer disapproval can be a good thing. A desire to fit in might make her alter her behavior because all Kate does is explain it away. I'd bet TLC already edits out the really over the top stuff.