I've seen these posts, and they're horrible, mean-spirited, and hurtful.
But as far as I've seen all those posts have also been downvoted to hell, flagged, and hidden, and the users often banned, and they're often from new "green" users rather than regulars. It's entirely possible that some of these posts remained (especially if they're posted after the conversation died down and there are less eyes), but I'm certain that if you email dang that he will take action.
At some point the first comment on one of my articles was "gay n---r soiboy" or something to that effect from a new account – a curious comment since my website has a picture of me being white enough to get a sunburn in Ireland – but how do you prevent that? Limiting sign-ups is the only thing I can think of.
I can definitely understand that people feel very negative about these things, but I think it's unfair to judge all of HN by it – you're essentially judging a community by the posts that were considered inappropriate and were removed.
And if you don't like HN (for any reason) then that's fine, so don't visit HN then. All this tomfoolery with referer blocks seems rather at odds with how the internet is supposed to work; "microsoft.com blocks links of the referer is from lwn.net" would cause a loud uproar here.