Why is hate speech still tolerated in certain parts of 4chan?
Technically it is against the rules.
It's just I've never seen the mods outside of making off-topic racist threads on outside of /b/ and /pol/.
You mean "the board that actually believes banks are heroes and poor people are villains"?
>hate speech rips people to shreds
No, people rip themselves to shred by being butthurt. "Hate speech" is just "free speech that hurts my feelings." If you're offended so much by the free speech of someone else, you don't deserve free speech yourself.