it's just a joke dude.
it's not the end of the world when white people make fun of black people, either, you're just thinking of the black equivalents to yourself; being people who get all shitty and serious when racism is brought up. vids like this, as well as shows like chappelle's show, are made by funny, understanding people who don't give a shit, so they make jokes about it to try and remove the stick from eveyone else's uptight ass (and giving the others a good laugh).
chill.