The doctor probably can't understand why you want to drink alcohol when you have been diagnosed with a fatty liver. He was expecting you to be more concerned about your health.
There are two types of fatty liver, one caused by drinking alcohol and the other by lifestyle, like being overweight, on the way to being diabetic, etc. If you fatty liver is cause by lifestyle it is potentially serious if you don't take steps to change you life. Alcohol will make the condition worse.