I was told to stay away from intoxicants due to my MTBI/PCS when I was 15 (1970). I never had a problem enjoying myself around friends who were getting buzzed. I had to realize that I was as free to act as stupid or goofy/foolish/uninhibited as them. So, I would just let my guard down and enjoy myself and my friends and not be a risk. And, I would remember the evening.

Let their attitude be contagious. It is not hard to do.