well babita said something today they got angry because it was first time. Babita has never answered them back so they are used to it. If babita makes it a habit instead of going back n fro they will get habituated to it
speaking from what i have seen in real life, they would have gotten used to it had babita answered 17 years back. now they are used to a meek and docile babita. any change would be a big hit for them, specially their ego - jis bahu ne itne saal jawab nahi diya, woh aaj kaise jawab de rahi hain and all. how dare she.