When they first meet, Estella treats Pip horribly. She makes fun of his appearance, his stature (social status) and how he speaks. She mentions his clothing and his thick-soled shoes. She repeats the phrase "common boy" when referring to him or even speaking directly to him. Then she teases him for calling the Jacks (in a deck of cards) Knaves.
In fact, she seems eager to make him cry. Miss Havisham raised her to be cruel and reject any form of love. She herself was never taught to love or how to feel loved. So her first encounter and many more after that with Pip are all very hard on him. He so badly wants to win her over, only to finally realize that she will never have him.