Teaching a kid that people (and by implication the kid him/herself) are inherently good/bad (or in any way "fixed") is a really bad idea for a number of reasons. He's trying to keep her mindset growth-oriented.
"There are no neurotics or geniuses or failures or fools. There are only neurotic moments, flashes of brilliance, failed opportunities, and stupid mistakes."
-David K. Reynolds
A much better idea is to teach children to read other people's emotional state in the moment; to develop their intuition and teach them to trust it. It's that intuitive ability that will allow the child to escape arbitrary danger and to thrive in general.
"There are no neurotics or geniuses or failures or fools. There are only neurotic moments, flashes of brilliance, failed opportunities, and stupid mistakes." -David K. Reynolds
A much better idea is to teach children to read other people's emotional state in the moment; to develop their intuition and teach them to trust it. It's that intuitive ability that will allow the child to escape arbitrary danger and to thrive in general.