Idiots will be idiots and racists will be racists.
Obama becomes president and there are still a lot of Black lawyers, Black mayors and even Black governors but does the bigoted stereotype about Black people being uneducated, loud and "ghetto" get defeated?
A Latina becomes a supreme court justice and there are people who work in the White House (senators and congressmen) who are Hispanic, but do dumb rednecks still shut up about Hispanics being illiterate, not learning the English language and being illegal?
You have Yao Ming, Ichiro, Troy Polamalu, Dat Nguyen and Hideki Matsui playing pro sports, but do hicks stop going on about Asians being nerdy and unathletic?
You have Bill Clinton and tons of White people who don't care about skin color, Whites who would help a Black, Hispanic or Asian out if they could but there are still idiots out there who think White people are evil racists right?
Bottom line, it won't stop. There are tons of racist people out there and tons of idiots out there who will continue to stereotype groups as one. In the end all you can do is ignore them because usually those are the bigots sitting at home, jobless and single.