It's also the case that we take for granted in middle class culture that there are social rules that you will be socially punished for in terms of stigma and ostracism if you don't follow them. for folks who don't know those rules, every interaction carries a threat of hostility that has an impact for them that goes far beyond the popularity contest of the privileged. That goes double with social stigmas. A frat boy gets loud or confrontational and he gets an eye roll. He also knows from experience how far he can push it before he sees any real consequences. A black person or a homeless person that does not know how to give the right social cues gets the cops called or gets banned from establishments. Enough experiences like this produces antisocial behavior.