I read the book and I saw the movie. However, I saw the movie first.
I loved the mother's movie character, the one with cancer. And I love how she took Hilly to task at the end of the movie. (Of course, that actress is such a good actress.)
I understand what you are saying about the difference in the movie and the book, and I'm a Southerner who did NOT grow up in the deep South. I too cheer for the villians to be "told off". There really were women like Hilly who would castigate others for not bowing to their demands to treat the blacks like 3/5th's of a person. And there really were people who refused to do it, like the gal who got the book published.
Hilly's personality is still here today. Perhaps she isn't championing white domination of the black race, but she is still here. Most of us know the type. I for one LIKE that the movie shows her getting her due. It didn't feel fake to me, especially when the mom let her have it on the porch. I understand people saying they laughed in the movie - at that point I cheered. Hilly needed her comeuppance.
What I think about is, what did the Hilly types think of when they were old and gray, and colored bathrooms and fountains and sitting at the back of the bus and all the other Jim Crow inequities were a thing of the past? Were they ever ashamed of themselves? Did they ever really understand what they did, or how they looked? Did they ever realize that pulling us ALL up as human beings, economically and socially, helps everyone? I'd like to think so, but the point of Miss Hilly is probably that some people NEVER get it. They are too busy subjugating someone else in order to make themselves feel important.
I know some Miss Hilly types, and I know people who won't put up with them, so I don't think telling off the villians is fake at all.
So there ya go!
Dawn