I'm not quite there yet in my sobriety but I can relate to feeling like I ruined x-mas... I got black out drunk at the in-laws... I wasn't the only one drinking and eating pot brownies but I was horrified with myself in the morning and haven't drank since. I know for me that I probably could go out with other drinkers but I wouldn't want to put myself through it. I don't like other drunks when I'm sober. If you have made a decision to not drink then maybe being around it just isn't for you anymore and he will have to learn to fly solo when he wants to go out partying.
But there are people on here with more sobriety than I who could probably give you better advice.
All the best.