He didn't say all prohibitions rooted in racial animus targeted multi generational households. I knew a city where people said they supported unrelated tenant restrictions because they didn't want migrant workers living in their neighborhoods.

Secondary suites are desirable for multi generational households. They are or were banned in many places.

The cities where you lived allowed any number of related people in a 1 bedroom apartment? A 2 person per bedroom limit seems common. Related or not. And prohibition of a child sharing the bedroom of an adult or a different sex child or a different gender child.