Harry venomously shared his perspective with Allie regarding this: "That man must be at the end of his tether with Marge's awful temper."
In short, Marge's resentment grew deeper day by day. She began to lecture and pick fault constantly: Allie was a wild, ill-bred little girl just for wearing jeans, while Harry's smile was too fake, and he wore glasses simply to pretend he was well-read...
Yet, under Uncle Vernon's oppression, they still had to force smiles and humbly endure these unprovoked misfortunes.
Chapter 121