Wouldn't "Everyone should do what my moral code says they should" be subjective nonrelativism? Surely there are lots of people who believe that.
I don't think the people who believe that, think that their own mental states are what determine the truth of their moral code.
Less Wrong is extremely intimidating to newcomers and as pointed out by Academian something that would help is a document in FAQ form intended for newcomers. Later we can decide how to best deliver that document to new Less Wrongers, but for now we can edit the existing (narrow) FAQ to make the site less scary and the standards more evident.
Go ahead and make bold edits to the FAQ wiki page or use this post to discuss possible FAQs and answers in agonizing detail.