Green Tea?

Last night our break room microwave had completely quit working. So, I ventured into the surgical waiting room to get some hot water for my tea. Some family members of a patient saw me and struck up a conversation. As I was heading back to work, they asked me what I was drinking. I told them that I was drinking green tea.
The woman literally turned up her nose at me. "Hmmph" she said and turned to her daughter "She looks like the kind of person who would drink green tea".

    ****What does that mean?****