How does Francis provoke Scout?

Frances povokes Scout by bad mouthing her father.

“Just what I said. Grandma says it’s bad enough he lets you all run wild, but now he’s turned out a nigger-lover we’ll never be able to walk the streets of Maycomb agin. He’s ruinin‘ the family, that’s what he’s doin’.”
Francis rose and sprinted down the catwalk to the old kitchen. At a safe distance he called, “He’s nothin‘ but a nigger-lover!”