Can she not take banter or was I appropriate?

I asked a girl I tutor a question and she answered it appropriately, but because her answer could be interpreted in a dirty way - another one of her colleagues said she had a dirty mind.. so she laughed, but when I asked her the same question again with a wink - she looked upset. Why was she upset? was I rude or was she rude and she can't take banter?

Can she not take banter or was I appropriate?
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