4chan as a whole isn't racist. 4chan is just honest and unfiltered. Honest discussion is pretty much impossible on any other mainstream web platform. Websites like hacker news are heavily moderated to "stay clean" and then we got reddit, a dystopian wholesome echo chamber.

By the way: Pretty much every other 4chan user is looking down on /pol users. They don't trust /pol, because they realized it's indeed inhabited by the bad kind of racists and generally heavily biased people.