You shouldn't blame yourself, but I will blame your employer for allowing you to interview candidates without sending you to training in advance. And I think it's great that you are seeking out information and guidance on your own. You are correct that you asked a less-than-sensational interview question. Let me next fill you in on why the question is a problem, and how to handle future interviews more effectively and without shocking anyone involved.
via What’s Safe to Ask During an Interview?.
