The problem here is that you're paying attention to their bullshit question. When you spend time justifying yourself it rewards the person for asking the quest

The problem here is that you're paying attention to their bullshit question. When you spend time justifying yourself it rewards the person for asking the question (because they're getting attention) and makes it look like you need to justify yourself. (Although I suppose after enough impromptu five minute speeches about blood diamonds people will learn to stop asking you about the ring :) )