Unless being drunk is your idea of fun (in which case it seems doubtful you'd be a non-drinker), I cannot understand how drinking liquid A at a party is any more boring than liquid B.
As a person who does not necessarily enjoy drinking (nor does so very regularly), I would say that being sober around people who are drunk is objectively less enjoyable than being drunk around drunk people.
In fact a graph of my enjoyment as a non-drinker (in my experience) would probably be inverse to a graph of the enjoyment of the people getting progressively more shit-faced.
Unless being drunk is your idea of fun (in which case it seems doubtful you'd be a non-drinker), I cannot understand how drinking liquid A at a party is any more boring than liquid B.