Read his post again. You'll notice that he meant that he found the concept of someone believing that the color of their skin makes them superior to other people absurd.
Myself, I've quite a few white friends, and a few friends who aren't from this country (USA). We make jokes poking fun at the stereotypes occasionally. It's never meant to be offensive, though.
I also find it absurd that people attack other groups of people merely for being different, but hell, throughout history people have killed because they thought their race/ethnicity/nation was superior to others. But, since people have a tendency to almost never learn from history... well, look at where we are now. There are still quite a few ignorant people around.