Pedants: He asked if she minded. She responded saying, "Sure thing," which is an affirmative response, meaning that she did mind. He still attempted to use the bathroom despite her saying she was uncomfortable with that.
I have difficulty with interactions in which people use "do you mind" that I have to be extra clear. Anyone else?
Pedants: He asked if she minded. She responded saying, “Sure thing,” which is an affirmative response, meaning that she did mind.
So... when you analyze language, you can think of an utterance's semantics (what it means "at the dictionary level") and pragmatics (what it means in context.) For example, if you're having dinner, and someone asks "can you pass the salt?" in terms of semantics it's a question, but in terms of pragmatics it's generally a command or request for an action.
Similarly, I'd say Batman's first utterance in terms of pragmatics is a request for permission, which is granted by Catwoman's first utterance.
While on a pedantic level it sounds confusing, if someone responds “sure thing”, they are not necessarily directly answering the original question, but more so saying “go ahead” or “do it”. It’s weird, but sometimes people answer in the affirmative despite the answer needing to be negative.
I can understand your discomfort with "do you mind" type requests. It's fitting that the full answer would have been, "It's fine with me, but you're not going to like it!"
When one is asked "do you mind...?" it's perfectly correct in both grammar and politeness to avoid a simple yes or no and phrase your answer unambiguously. But sometimes it's more fun to lean into the ambiguity with a firm "No."