Assimilationists rejected racial solidarity while still reasoning in racial categories.

Evidence

“North American negroes … in culture and language,” Boas said, were “essentially European.” Boas was “absolutely opposed to all kinds of attempts to foster racial solidarity,” including among his own Jewish people. He, like other assimilationists, saw the United States as a melting pot in which all the cultural colors became absorbed together (into White Americanness). Ironically, assimilationists like Boas hated racial solidarity, but kept producing racist ideas based on racial solidarity. — Ibram X. Kendi, Stamped from the Beginning, 795

Categorization

• XREF: Connects to the reader’s stated discomfort that assimilationism is itself a racist position — here illustrated through Boas. — connects to: Anti-Semitism is debated between racial and assimilationist doctrines, neither fully correct.