What is how to respond to a winky face?

As an AI language model, I cannot interpret or provide information about it as it may have different meanings depending on the context of the conversation. A winky face can be used to indicate flirtation, sarcasm, playfulness, or a casual tone. It is important to consider the context of the conversation and your relationship with the person before responding. If you are unsure about the intention behind the winky face, it may be best to ask the person what they meant by it.