You can mute subs and block users which I've found to be quite helpful. Sadly the answer is simply racism and most of the racist people here are quite unintelligent and don't offer anything to the pyramid of debate and just drag the site down as a whole. The best thing we can do is report them and hope that mods and admins will take action at the low brow racial slurs and epithets being tossed around as one to three word comments. If they're going to be racist they should at least have to express and defend their opinions.