Beats me. A week ago, Sarah Palin proudly compares herself to a pitbull in lipstick. A couple of days back, Barack Obama completely fails to compare her to a pig in lipstick (he was obviously referring to McCain’s policies), and she gets all hoity–toity.
Look, Mrs Palin, a pig is an intelligent and useful animal and a pitbull is an ugly, stupid, vicious, downright dangerous beast with absolutely no redeeming features. Now it is perfectly clear that you resemble the latter a good deal more than the former, so when someone says something a least relatively nice about you, try to be a little grateful.