If someone says you are ugly, how should you respond?

First of all, it is important to remember that appearance is subjective, and we should not rely too much on other people's evaluation to define ourselves. If someone comments on your appearance, you can consider the following ways to respond:

1. Maintain self-confidence and self-esteem: Don't let other people's comments affect your self-esteem and self-confidence. Believe in your own value and beauty.

2. Respond and express your feelings: You can respond and express your feelings. For example, if you say that I am ugly, I feel uncomfortable, or I think we should focus on other more meaningful things.

3. Change the topic or end the conversation: If you think this topic is embarrassing or there is no need to continue the discussion, you can try to change the topic or end the conversation. For example, you can say I think we should talk about something more interesting, or I really don't want to discuss this topic.

Most importantly, don't let other people's comments affect your self-esteem and self-confidence. Remember that your value and beauty are unique, and don't let other people's opinions affect your mood and life.