So, racism is defined as what may or may not be seen as offensive from one race to another.

Taken from the Wikipedia article on Racism: 'Racism is the belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race'. After some googling I've found many respectable sources that provide a point of view about 4chan as a website that permits racist commentary and hate speech, but instead, not enough reference to this topic is found in the curent revision of the article, there are many sources out there confirming this, besides KTTV's report.