Like you say, it's not egalitarian towards those who don't have an easy time ignoring the hate speech. And, okay, in principle if the strength of one's stomach for hate speech was randomly distributed to humans with no correlation to anything else, maybe that would not disqualify it as egalitarian.
But it's not. People who face discrimination and hate speech IRL will, on average, surely have less tolerance for it online than people who don't. I have to believe that women, racial minorities, religious minorities, and so on, feel much less welcome on a place like 4chan. They've already spent their "ignoring hate speech points" ignoring someone harassing them on the subway.
So whatever it's virtues -- and I'm willing to believe you there are some -- I don't think that a place with this much toxicity can rightly be called egalitarian.