what observation does mr.morrison make about the wallaces

Here is a quote fro chapter 4 which explains this,

“Sometimes a person’s gotta fight,” he said slowly. “But that store ain’t the place to be doing it. From what I hear, folks like them Wallaces got no respect at all for colored folks and they just think it’s funny when we fight each other. Your mama knowed them Wallaces ain’t good folks, that’s why she don’t want y’all down there, and y’all owe it to her and y’allselves to tell her. But I’m gonna leave it up to y’all to decide.”