I'm on FD to track calories/nutrients for lean weight gain (muscle) but alcohol has a similar sabotaging effect there as well, especially particularly carby alcohol like beer and wine. I started out a skinny (almost nonexistent) 160 lbs last month, and I'm up to 165 now after a few weeks of really solid work at the gym and in the kitchen. However, last weekend my girlfriend came to visit and we partied hearty (couple beers apiece, champagne and the most romantic straight whiskey shots I've ever taken). Under normal circumstances I'll enjoy a few beers per week but I don't drink on a daily basis or anything. I also ate a lot more carb than I'm used to and lo and behold, Tuesday I notice a nicely-rounded beach ball under my shirt. Anything that I could see of my barely developing "two-pack" last week is now obscured by a generous layer of fat. Oh well, back to the grind, I guess.
Any regular use of alcohol is best avoided if you want to reach your goal quickly and cleanly, that's my experience.
1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
3) live - relax, de-stress, meditate.
Disclaimer: I'm not professionally qualified to make any formal recommendations. I've just done my homework and I'm my own guinea pig. All of my data, unless otherwise cited, comes from a sample size of n=1 (me).