The only science relevant to if something is “normal” in this context are the social sciences, which would very much not say otherwise
Well, only if you disregard your health completely. And speaking about social issues:
"Even moderate drinking by parents can leave children feeling embarrassed or worried or lead to their bedtime being disrupted, according to the study led by the Institute of Alcohol Studies (IAS). "
Alcohol cannot be defended from any position, just as cigarettes, even if fortunes are spent by alcoholic and tabacco corporations to “warm” their picture.