This was said during the 70's when it rang true for the nba/aba
The reality is during that time and its somewhat true today, there is a cultural divide among races for the most part. Whites often went to nicer schools, more likely to have both parents and also more likely to have people around them that were in the position to help them to suceed. From that stand point they probley developed a better sense of community and what not. Whites often had many oppurtunites avalible to them and probley occupided there time with things other than basketball. It was often the opposite for blacks and was often a "survival of the fittest environment and due to the lack of oppurtunties, you breath and sleep basketball if thats your craft (which was one of few options that most blacks saw for themselves at the time).
The idea of making it in the NBA for many whites was seen as an option where as for blacks, making it to the nba was often seen as a neccessity. You have to look out for yourself and your families best interest so you do develop selfish tendancies. You do have to work on being the best player you can be individually because there so many people that can go to the NBA (or ABA). Once you make it to the NBA, then you probley feel like you made it and accomplished the goal of providing for your family (and fame .. all that stuff that comes with it). Many black players are living it up and not thinking much about the future because they didn't have many oppurtunities growing up so they are trying to make the most of it while its still there and couldn't picture achieving that without basketball. Many whites on the other hand experienced and were exposed to many things growing up, plus they were probley handed oppurtunties that most blacks were not. This led to them thinking theres a life beyond basketball and if they were not playing basketball then they could be doing well doing somthing else.
Overall, I think theres something to what he said and people shouldn't get offended by it because its just his observation at the time. Its really a cultural thing and not specifically a race thing but it just so happens theirs a cultural gap among races that still lies today for the most part but it is closing and hopeful will continue to close.