In a group setting a close one casually mentions that your existence is irrelevant anyway. What would you do ?

If someone close to you casually mentions that your existence is irrelevant, it can be hurtful and offensive. In this situation, it is important to address the comment and express your feelings about it. You might say something like, “I’m sorry, but I don’t think that’s a very kind thing to say. I feel hurt and upset by your comment, and I don’t think it’s true. I have value and worth, just like anyone else, and I deserve to be treated with respect and consideration.” It is important to communicate your feelings openly and honestly, and to stand up for yourself in the face of hurtful comments.

Alternatively, you can insult their mother.