First of all, I don't feel there was ANY excuse for Joanna's behaviour to Christy. And, the whole "talk to the hand" bit was not only rude but so very "that was hip YESTERDAY".
I think Christy handled Joanna's outburst rather well. And, I give Christy credit - this has got to be a really rough situation for her. I don't blame her for the dust up about the shelter. The girl wants a roof over her head at night! It does NOT take the entire tribe to keep the fire going and to gather water!!! The shelter should have been their first priority. They have kerosene lamps and a flint, for gosh sake. Everyone was laying around - did they all decide to rest at one time?
Christy is still my favorite of all the women - she's got guts, and isn't afraid to say what she thinks. Maybe not the best way to win at Survivor, but a good way to get through life.