I'm not sure how you've come to that impression. The boards I used to frequent are hobbyist ones, not political, yet they have people calling each other the n-word all the time. On /fit/ anything done by a large corporation or as a moneymaking scheme is talked about as if it's a Jewish conspiracy, to the point where they call highly-processed food "goyslop". /g/ hates Indians and calls software and technology that it likes "the white man's choice." I could go on. This pervasive background of racism is all over 4chan, and I wonder why you're trying to downplay it.