The fact, that he was brave enough to fight with the guy, who tried to steal his car, became the evidence of the inner change, which had happened to Cameron.
At the same time, it should be noted, that the characters put their cultural identity not only in their group, but they also want to be accepted and acknowledged in all cultural groups. On the other hand, the characters, who are supposed negative, as Ryan (the policemen, who has sexually assaulted Christine, Cameron's wife) or the attorney's wife Jean, being extremely impatient towards any other race except her own, also try to put themselves forward not only in their cultural group, but in others as well. Ryan not only wants to be the best among his co-workers, who are of Caucasian race, he also wants to show his superiority over other races, and thus make them understand his significance in terms of all races.
The issue of cultural identity is shown to be manipulated through the scene in the attorney's office.