I would refrain from visiting that subreddit. People are allowed to say what they want. Freedom of speech, even "hate speech," serves an important function. It's a method of venting, and sometimes bonding. Supressing freedom of speech is dangerous--it gives people a feeling of being oppressed and controlled, and can lead to feelings of rage. In Germany during the Weimar years, criticism of any religious group was banned--this was effectively an attempt to silence any criticism of Jews. Prominent members of the Nazi party did jail time over it and were seen as martyrs of free speech by the German population, who later put them in power. If free speech had not been suppressed in Germany, the Nazi party could not have gained as much power as it did...WWII might have been averted altogether.

So, as much as I'm not a fan of people hating on white people, if their "hate speech" against whites releases some pressure and actually reduces overall hatred and violence towards us, it's probably worth it.