Is Drinking Alcohol bad for your hair ?

No,
But commercial and natural beauty and hair product containing Alcohol.
Alcohol usually found in hair sprays and gel and it dries faster on your own hair.
Used this product for better detangle hair: Cetyl, Stearyl, Cetearyl, Myristyl, Behenyl, and Lauryl.
Avoid this alcohol product for better hair: Alcohol denat, Ethanol, SD alcohol 40, Propanol, Isopropyl, and Propyl.
So use Alcohol-free product 
Click below Alcohol-free product 
 
Mamaearth Happy Heads Natural Protein Hair Shampoo 200ml with Biotin, Horse Chestnut, Bhringraj and Amla. Sulfate-Free, SLES Free
 

 
The Perfumer Hair Perfume Spray For Women, Fresh & Fruity, No Alcohol, Mist, Chemical Free, No Frizzy Hair After Spray, Party Essential, 30 ml