Shop clerk

I went to pharmacy to by YOMEISYU yesterday. It wasn't price tag with it. So I asked a shop clerk the price. She told me the price and she asked me whether I ever have drank it. Of course I answered I drink it every winter season. She noticed me that YOMEISYU is kind of alcohol. Of corse I knew it I drink it every winter season. She seemed to want still to tell something to me. she might suppose that I was teenager.

I told my husband about the story, he seemed be speechless.

The shop clerk didn't need to notice me whether YOMEISYU is alcohol if I was more than 20's years old. What would she want to say to me.