Your typical can of pisswater beer has just under 150 calories. The more alcohol in it, the more calories. Same for sugars. So, yeah, if you drink a shitload of it on a regular basis, you'll get fat. Just as if you drank a shitload of pop. Obviously, by extension, wine is more caloric than beer, and liquor yet more. You just don't drink as much of it (or if you do, you have bigger problems to worry about than an expanding waistline).
What's more fattening than the beer is the peanuts and popcorn and pretzels and shit that they tend to leave around the bar for your drunk ass to snack on all night (which are salty, making you drink more, and thus is the circle of lardassity completed).