Joy is just a rude, spiteful, bitter woman.
She was furious yesterday because one of the foreign dignitaries told Governor Palin that she is beautiful. It's true, so why should this bother anyone.
And I recall Joy bashing Paris on the show before when Paris was not there, so yes, Joy has talked "behind" a guest's back. She had also repeatedly bashed Clinton for the Lewinsky incident, but was practically kissing his feet when he appeared.