I agree that drinking makes us more honest and it releases our true feelings, this is because drinking shuts down our mental breaks (scientifically, it is called the prefrontal cortex), and thus our animal and primitive instincts and blocked feelings surface. Maybe that is why people don't praise drinking, because we need our judgment to interact in an appropriate way with others, and this includes hiding our true feelings if they are hurtful and not appropriate.

Regarding the incident itself, I think it is OK to drink occasionally, and being drunk occasionally isn't the worst thing in the world, although maybe it is better not to drink to the point of being drunk. I personally feel freer when I drink, but I have never been drunk.

Good you have communicated with your BF and made things clear. This was the right thing to do.