I don't know what it is, but people that give out samples seriously **** me off. I like to be left alone, and it never fails that whenever I go out grocery shopping, people are always pestering me to try a free sample, or sign up for a promotion I have no interest in. If somebody approached me with a sample of alcohol I'd simply say no thank you, and if they pressed further I'd tell them I don't drink. I think you handled the situation well, and I understand if you were frustrated.