I'm there for my friends. Some I have walked away from, as I indicated above. Not that I don't wish them well, but they tended to be users and took advantage of me and my generosity. People who contribute nothing and only take.
The person in question here? I am ALWAYS there to talk, to get together for a walk or dinner, to share my experiences with sobriety.
I also get together with some friends who drink too much. For instance, I met an old party buddy for a concert a few weeks ago. He had several cocktails at dinner beforehand. I had enough sobriety under my belt at the point that it didn't bother or tempt me in the least. That said, I won't go to his house while he and others are pounding drinks. I've turned down invitations where I knew the situation would be like that.
Also, I don't want to be that person who has quit drinking and now everyone in his or her vicinity also has to quit. Lecturing, gloating, etc. We've seen people like that, and few are more annoying.