Doesn’t agree with my experience. I generally find that people are more relaxed and open when not sober.
I am also generally skeptical of arguments of the form “if we counterfactually modified aspect X of the world to aspect Y, the world would be more awesome, therefore we should start trying to change X into Y” because they ignore transition costs. (A simple example is X = imperial units and Y = metric in the US.) The world would probably be a better place if the social role of alcohol was replaced by a less destructive drug, but I don’t think it’s feasible to actually force such a replacement to occur, or at least I don’t think it’s a good use of political resources.