It's an interesting point and it's not just confined to aviation. I'm sure everyone can name a friend who turns into a t_sser when drunk.
It's a shame because I can see where it's going: either the total elimination of booze on flights, or legally forcing airlines to charge for alcohol. This will spoil it for the rest of us who like to pass the monotonous tedium of long haul flying by relaxing with a bottle of red.