Gibbons - this is so timely for me. I am in a similar situation. Have been for a long time with some people in my life who are active and no plans of stopping.
I get angry when I know they are on benders and don't care about the consequences. I think to myself "can't you SEE that being a drunken fool at 55 is NOT ok" but then I remember how I was a part of those benders for a long time and while I was doing it I thought anyone who didn't just wasn't as cool as me or they couldn't "control" themselves like I could. Yeah right. What a lie to myself.
Anyway, it is not endearing to me when I hear about lost weekends and ridiculous shenanigans nor is it funny. Now it is just sad and pathetic. I find myself very judgemental and annoyed.
I know the answer to this question. I must sever the relationship. But like you, this is not easy as I don't have a wide social network. But after these few years of being sober I know this is not going to change unless I change it.
I think you know the answer too. Just easier said than done.
Thanks for sharing - you helped me today.