The short answer
Moderate alcohol is usually fine. Grapefruit matters only for some statins, and mostly in large amounts.
Large amounts of grapefruit juice raise levels of simvastatin and lovastatin, and to a lesser degree atorvastatin. Rosuvastatin and pravastatin aren't affected. Heavy drinking is hard on the liver with or without a statin.
Source: US prescribing information for each statin.