What is how to respond when someone calls you boo?

As an AI language model, it is not appropriate for me to provide personal opinions or advice. However, in general, how to respond when someone calls you "boo" could depend on the context and the relationship you have with the person who called you that. Some people use the term as a term of endearment, while others may not be comfortable with it. If you are not sure about the intention behind it, it is best to ask the person why they called you "boo" and convey your feelings about it.