The first one could be viewed as racist because the white guy is the only white guy there - claims it's "awkward" and then offers fried chicken to the black people around him stating it is "too easy". Those who don't see the racist element at all... exchange the KFC for Watermelon... see maybe a bit of it now? So I didn't see it as racist the first time I watched it, but I looked at it again 3 more times with a critical eye and yes, it could be construed as racist.
The second South Park --- it's more racist against the Chinese. Knowing the hisotry of the American Indian and how the Army and others infected blankets with Small Pox... I find it not racist to White Americans nor American Indians but a commentary on the slaughter of the native American people of this country. The Chinese could be a little miffed but then again, they're big boys and can take it. IT was funny though.