If they can better accept themselves, they can also learn to consume less alcohol. Try an experiment at your next party. Between each drink, substitute a glass of soda or ice water and eat whatever nibblers are available. Let at least one-half hour lapse between finishing one alcoholic drink and beginning the next alcoholic drink. See if you don't feel more relaxed and consume less alcohol.
Some people are just plain thirsty after arriving at a party.
If experiments like this do not work for you, it may be a good time to examine the role that alcohol plays in your life. Another drinking stimulus is anger. Instead of dealing with the angry feelings directly, drinking is substituted. That way if I'm nasty or make angry wisecracks, it's the alcohol and not me. That seems like a good way to end up feeling pretty lousy about yourself for not dealing openly and honestly with your feelings.