that despite her obvious hatred and holier than thou attitude are extremely nice and kind to her.

Most people just look at the superficial aspects of the film, assuming she is the "Beauty" and he is the "Beast".
She is judgemental and awful, just like "Beast" was. But the movie teaches her to look past her selfish and judgemental patterns. At the same time, seeing her change helped Beast soften his bitterness at his course. He learned to move past his pain.