The worst drink is always the fine white wine that your 'wine buff' friend insists on buying at the restaurant, that tastes like cat pee but because you ain't a wine buff you have to either agree(and drink more of it),or disagree and it's implied you know nothing about wine.
I may not be a wine buff but I have a very good palate for all sorts of drinks and food and I know when something tastes disgusting.I do not need a label to tell me something is good.