Why is she being so sensitive?

The girl that I’m dealing with has a small dog and as we was playing I plucked her dog on the nose playfully. She got upset and told me that she didn’t like that. I told her it’s just the dog nose and it’s not that deep. But she told me to leave and to talk to her later. What did I do wrong. Why is she being so sensitive?
Why is she being so sensitive?
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