Whilst what Nigee says was undoubtedly not a great thing to say, there are a few points that need to be made;
1) spic is not the same as n* - the two words do not have a very similar history and thus, whilst both are clearly bad, they do not carry the same power.
2) Nigee has a history of saying ridiculous things, to the point where it's very had to get a consistent idea of his worldview. Thus, to use him as an example of a hypocritical liberal is rather strange when it's not entirely clear whether he identifies as a liberal.
3) When the only time the Krellin appears to care about language is to score points in an unrelated thread, it becomes clear that he doesn't really care about the power of language and instead is just seeking to derail threads so that they become about himself. In this case he's been successful, but I would hope that, in future, the community treats his comments with the contempt that they invariably deserve.
None of this is to say that what Nigee said was a good thing to say, nor is it to condone racial slurs and epithets, but when talking about them we should take care to avoid false equivalencies, and any show of care which is obviously not about the issue but instead about grandstanding should be shot down immediately, as it's just incredibly disrespectful to those that the issues actually affect.