Neither S wanted to go to an HBCU because they wanted to go to a place with more racial diversity.
Older S, 24, otherwise didn't pay any attention to the racial diversity.
Younger S, 19, did pay attention to racial diversity. He wanted all kinds of diversity, and has always had friends of all races. He now attends a college where only 5% of the student body is black. He continues to have friends of all races, and is happy.
I think, however, that black females are more likely to be concerned about the racial ratio because it's not as easy for them to date outside of their race as it is for black males. Due to the shortage of black males, it's hard enough for black females to date within their race.