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No, it's fine, I wasn't at all offended.
Sometimes, people do get incredibly sensitive about fanfic. I don't know if it's because they feel stereotyped, or that they are just too close, too invested in it. And it can often come off as very hostile in person. I've had that happen a few times.
But it really doesn't have anything to do with my opinions on fanfic which are almost purely positive.