This is overly romantic. I just visited /g/. Less than 1 min in, I see "nigger" and "faggot".
I'm sure there are blacks, gays and drag queens that see value in 4chan and are desensitized to those words. But, I'd estimate 99% of the population is white men/boys with antisocial tendencies.
Which is fine. There's nothing wrong with like minded people building a village. But let's not pretend the culture of the site, doesn't instantly weed out a huge chunk of multiple demographics.