Is just proof that there are people out there who generalize us in this way.
I don't think people would be so quick to generalize African Americans if a large, noisy majority of them weren't doing their best to perpetuate and live up to the stereotypes. I've met quite a few educated well-spoken black people, but most of the rest I see around talk, walk and act like jailhouse thugs.
In fact, it seems that even geniune African blacks seem to go far out of their way to distance themselves from the members of their race that were born here! Every African immigrant I've met here (and there are dozens; they all seem to work ad furniture stores, oddly enough) do their best to speak correctly (to the best of their accents), act polite and dress nice.
The same can be said for my race too, Mexicans. The vast majority just act so damn... MEXICAN that it's frustrating.
Also, for the record, across the span of 31 years, 5 states and a dozen jobs, I've met exactly ONE white person with a "La*" name. I've met so many blacks with "La*" names, I've forgotten pretty much all of them.