Where did I offend you?
Can I say "where did I offend you?" instead of "what did I do to offend you?"?

Question

Answer

I don't think it would. Using "where did I offend you" would be asking about the location and not what the action was.

Answer

I think there's a specific case where you can say it, and that is if if you are looking at a letter or a written conversation, and you are asking the other person to point out on the letter/conversation the part they found offensive.

Answer

Perhaps you can say: how did I offend you? to what extent have I offended you?

There are many possiblities for asking the same questions.

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