Nina's a legend, I take her position as a person who became frustrated and disappointed with the direction Black people took after the Civil Rights Movement came and went, leaders were assassinated, murdered and then Black Power leaders and groups such as the Panthers being neutralized and ultimately collapsing, drugs (heroin, crack, etc) taking over the streets in Black communities among other atrocities.
I always kinda get look at her similarly to Billie Holiday, y'know they're both from an old era (1910s, 1920s, 1930s, etc) of Black America, and y'know, Black people in the late 1800s, early-mid 1900s treated each other differently in her days; witnessing how Black people were treating each other in the, 70s, 80s and 90s probably was devastating to her eyes, and therefore felt the community wasn't the same anymore, which led her to be disappointed and somewhat disgusted, the Black community she knew/loved was gone while this new version she was witnessing was unrecognizable.
Obviously, there are things to consider when it comes to certain declines, things in and out of our control, that took place within the community post-Civil Rights Movement. She was speaking from disappointment rather than out of hate when she said this, and in her mind, she probably felt Black America was beyond repair from some of the things transpiring, since the community was much different during her heyday.