Nah, white boys just cant be gangsta.
Al Capone, John Gotti, Bugsy Siegel, The Kray Twins, Lucky Luciano, the Gambino Family and many others would probably disagree.
As for white rappers, we have a few in SA - Sinister Dexter from the Realist, Waddy from Max Normal and Explicit come to mind.
Interestingly, between 70 - 80% of Hip Hop worldwide is bought by white kids (according to Russel Simmons).
Kanye West believes that white people should make white music - "I hate music where white people are trying to sound black. The white music I like is white. I like Franz Ferdinand. That's the shit."
According to political rapper Zion of Zion I, socially conscious hip hop has a mainly white audience: "...so many Black people don't want to hear it. They want that thug shit."