According to the Section 9, what has caused 124 Bluestone to have a “presence full of spite”?

From the text:

The return of Denver's hearing, cut off by an answer she could not hear to hear, cut on by the sound of her dead sister trying to climb the stairs, signaled another shift in the fortunes of the people of 124. From then on the presence was full of spite. Instead of sighs and accidents there was pointed and deliberate abuse. Buglar and Howard grew furious at the company of the women in the house, and spent in sullen reproach any time they had away from their odd work in town carrying water and feed at the stables. Until the spite became so personal it drove each off. Baby Suggs grew tired, went to bed and stayed there until her big old heart quit. Except for an occasional request for color she said practically nothing--until the afternoon of the last day of her life when she got out of bed, skipped slowly to the door of the keeping room and announced to Sethe and Denver the lesson she had learned from her sixty years a slave and ten years free: that there was no bad luck in the world but white people. "They don't know when to stop," she said, and returned to her bed, pulled up the quilt and left them to hold that thought forever.