The fact that the people getting drunk (and you) don't see it as anything wrong is a problem in itself.
As the old saying goes: it's not big and it's not clever; in fact it's a disgrace.
No, the problem is how judgemental you are being. Do you see these people judging you for going to York on your own? The fact that you are looking down your nose on people enjoying themselves in a way you don't understand says far more about you than them.