In my research into black fragility, blackness, and blackalgia, I've hypothesized that this is truly just rooted in fearmongering, protectionism, and sensitivity within the black American community (foundational black Americans, multi-generational black Americans, and related black Americans). As a concept, it is reactionary and defensive; it seeks only to protect the social orthodoxy and perspective of black America and its historical views on blackness. This view will be challenged in the coming years as migrants with diverse racial perspectives share their perspectives on culture, ethnicity, and racial dynamics. However, Racial-cultural exclusivity may persist.
There's still more research to be had...