British Expression: It’s not my cup of tea
British people say “It’s not my cup of tea,” to mean that something is not to their taste, be it food, music, films… anything really. For Example: “I went to the theatre last night but it wasn’t my cup of tea.”
I think it comes from the fact that British people tend to have a favourite blend of tea that they regularly drink. If they pick up a cup (or, commonly, a mug) and the tea tastes different to what they expected, perhaps they have picked up the wrong cup, and it is, therefore, not their cup of tea.