It doesn't sound to me like you did anything wrong. I think what I have in mind is more subtle than just asking questions. I don't have any objection to being asked questions in general. I would prefer you ask questions appropriate to the claims I'm making about myself - that is, I'll feel more insulted if you ask more than a couple of remedial questions. You may suspect I'm a fraud, but beware of communicating to me that you suspect I'm a fraud.