Drinking can also impair your ability to drive a vehicle, walk in a straight line or even to be able to walk at all. Of course drinking affects your ability to interpret social cues. And if that doesn't make you socially awkward, how about passing out in the hosts bathroom draped over the toilet? How about puking all over the floor when you don't quite make it to the bathroom?
Geez, I think this article is stating the obvious. ;)