Those people you know who are in denial have their own problems to deal with. You have yours. You can't do anything to help them, so please don't even consider it. The best test I know of to determine who to hang out with is: "Will being around them pose a threat to my sobriety?" If the answer is yes, then stay away.
Who you let know that you're working on sobriety is up to you. I have no interest in protecting my anonymity, yet I don't generally discuss my association with AA either. If nothing else, it keeps me from having to answer a lot of dumb questions. Those who should know, do.