Well, Fark is like any other Internet site.  Anybody can come and go as they please.  All it takes is an e-mail address to get an account.  There are people that troll, just like on any other site, and there are people who are bigoted, sexist, racist, etc, just as there are on any other Internet site (or just walking down the street, for that matter).  One of the downsides of free speech is that everybody get to express their opinion, no matter how misinformed or ignorant.