There are still segregated proms in the south today.
Work, at a professional-level job, in a major insurance company.
School.
Various gatherings/parties – some family (we all have THOSE family members, sigh), some that included friends of friends.
Sometimes just out and about, like the mall. Sports events.
It’s not just in the trailer park. I do think that if you grow up in the south and are white/middle-class, you don’t really notice until you move away for a bit.
I live in Kansas City and in many high schools thats also very common.
What has changed is now there are hispanics and Asians also who have either their own cliques or they join with one of the others.
At many colleges, even on liberal campuses, that is common also with segregated places like the “Black Student Union” and having their own activities.
Sometimes certain groups just want to hang with each other.
I’m from Kansas City and many people complain about Kansas City is that most black people here do not have professional careers. Indeed here about half of all the jobs middle class black people have are with the school district or the post office.
Now in comparison to Atlanta, Atlanta has way more black people with higher degrees, professional careers, and thus higher incomes and fewer working at these basic government jobs.