When I say that, I'm not speaking for myself, but just making an observation. Here is part of a speech made recently in Topeka on the anniversary of Brown vs. Board of Education, a ruling regarding Topeka schools that made officially enforced segregation illegal. It led to Federally forced integration, with black students being bused to white schools:
Ironically, it seldom resulted in white students being bused to black schools, which might actually have resulted in increased funding for those schools. But of course, the whites always had the option of pulling students out of public schools and putting them into schools poor blacks couldn't afford.
I'm 67, and I went to an urban high school in an area that was racially integrating. Back then, in the lunchroom, there were black tables and white tables and a lot of tension.
Today, I think there is probably less racial tension, but students apparently still tend to sit down with members of their own race. Ditto for families when choosing housing. While 100% segregation is rare and can't be enforced legally, we still have areas which are largely white or black or Hispanic.
This phenomenon is called self-segregation, and no amount of liberal talk about the need for full integration seems to be having much of an impact.
Is there actually anything wrong with people of all races hanging out with people of their own subculture, bearing in mind that white folks are no longer a majority in the United States and, thus, are a minority, too.