I don't get this perception that the codex hates everything new. Witcher 2 received favorable opinions and is accepted as a good (if not great) game, though it did start some heated and intelligent debate on whether it was actually an RPG with C&C. Considering how vocal and prevalent he is, its easy to think Metalcraze embodies the codex, but his 'everything is ****' gimmick isn't taken seriously by anyone. Even the new users are pretty much told that MC has no idea what hes going on about (most of the time, anyway, he likes ARMA2 which is definitely a great FPS).
General discussion is a bit offensive, true. But the vast majority of racists and weirdos are mostly being offensive for the sake of it. Very few people actually are real nazis or whatever else you think they are. True, to a new registered user like myself, it was difficult to separate the lulz from the real crazies, but once I bothered to look beyond the surface, it became easy enough to tell who was which. In anycase, beyond some shockingly offensive stuff and in-jokes, GD can be ignored.
In terms of general gaming and RPG discussion, the codex is only as offensive as you are. If you rush in laughing at them 'oldfags' and talking about how awesome oblviion or dragon age 2 is, you're pretty much asking for the stereotypical codex (or NMA) reaction to happen to you. If you politely ask them what they find wrong in Oblivion and maybe even give some examples of what you think it did right, you'll get some intelligent posters telling you just that. True, you are nearly guaranteed to have at least one idiot rush in and insult you and considering the topic I've just given, Mastermind will most likely come up with some insane Oblivion defense that riles up the other guys, but I guess what I'm trying to say is that these guys aren't as offensive, close-minded or rude as people make them out to be.
If you don't want to join, thats understandable. But to perpetuate the negative stereotype that the codex is some neo-nazi-racist hivemind that lives in a pre-2000 world is pretty much wrong in every way. I'm not the most articulate guy on the codex and I'm certainly not a very intelligent one. I'm not really a long time user either, having joined up in 2010. But I hope this post does in someway break down the stereotype that the codex is no a place for serious gaming discussion.