Yeah, Carole's remarks were rather crude. Maybe she thought the countess was trying to one-up her previously-- and this is her long-running form of payback. She talks as if it's common practice to preach down to people that way. If you feel compelled to criticize someone directly, especially on a touchy subject, in front of other people, at least do it graciously, and tactfully.
Luann's outburst was pretty offensive, even if she is Native American. Maybe it's worth saying something-- but not what was said.