Is it bad that my fiancee calls me an idiot?

My fiancee calls me an idiot from time to time, when I say or do something stupid. Before I took it as a compliment. However, people at work keep telling me that that's horrible, and my relationship is toxic. Is this actually toxic, or is this normal?
Update: Since everyone seems to be misunderstanding the question, let me say this. My fiancee is female, not male. Second, I am male not female. Third, this only happens after I say or do something stupid, like tell a lame joke.
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