Bingowings said:
She wasn't have a go at his species but his character.
Chewie is a Han's doormat and she's trying to get him to stand up for himself and not get dragged further into any of his schemes (see I'm better at this than Lucas).
Are you familiar with this hypothesis?
A New Sith, or Revenge of the Hope
I've only just recently come across it, but I'm thinking about maybe hinting at this kind of scenario when I do my edit.