Division, based upon real or imagined differences, within and between groups is at least as old as civilization, yes?
We can be disturbed, but we shouldn't be surprised when African Americans behave like other human beings by creating hierarchies.
Almost no one's shocked when, say, a middle class, suburban white guy frets about the purported threat a declasse neighbor poses to his property value.
But if that disconcerted householder is black, and if the outcast neighbor is also black we're especially disappointed as if an eldritch bond has been rudely broken.
.d.