I am speaking from personal experience, nothing more. I've played pickup on many occasions with lower middle class black men.

Also interesting to note: in my experience, in a mixed race group (e.g., in grad school), the smack talk will be toned down. The lone black guy will tone it down to fit in, just as I amp it up when I'm the lone white guy.

Lastly, please note: I'm not trying to portray trash talk as anything other than a harmless cultural practice which outsiders can be intolerant of.