While it could be considered indiscreet to broadcast personal conversations, it is obvious that Mrs. Bruni could care less about Mrs. Obama's reaction to her quoted comments. As far as I'm concerned, the sum total end-result, is a big "so what?" especially because Mrs. Obama doesn't deserve much in the way of respect.
That’s why one should never speak anything they don’t want others to repeat no matter the relationship.
If it’s true Michelle said it and was repeated my Carli it says more about their relationship—there is no respect there. She had to know that it could give ammo to those who hate this current administration.