For roughly four years of my life I drank every single day, usually starting early and ending late. My older brother, who sporadically lives with me, has been an alcoholic for fifteen years or so. I've dated and had relationships with alcoholics. Thus, over the last couple of years I read a lot of studies about it in an attempt to understand it a bit more. It's easily the biggest, most painful obstacle in my life and I always felt like if I could increase my knowledge, it might help me cope with it more.
Essentially, the main point I got from reading several studies was that there's an irresistible myth that alcohol makes people more honest or frank. Thus, the notion is that the actions of people who are inebriated are a true reflection of their character and how they would act all the time if they were free of inhibitions. In fact, tests have shown that the effect of alcohol is essentially completely random. The chemical imbalance it triggers in the brain and central nervous system is akin to a game of roulette where the wheel is the size of the moon, every single number is changing at random, you're blindfolded and the ball is a '79 AMC Pacer. Thus, as much as a cop out as it might seem, you can't really judge people to be acting in any kind of rational or even logically determined way when they are drunk because it doesn't work like that. When inebriated, anybody is capable of borderline anything. You're not you when you're drunk - in fact you're less like you than it's possible to be otherwise.
So basically, this study doesn't surprise me at all. If you're drunk, you're going to do all kinds of completely uncharacteristic, ridiculous bullshit because you took a chemical intoxicant.