ChatGPT's answer is not the only answer that would pass the test. The point isn't to see whether they claim Bob likes or dislikes dogs. It's to check whether it has a theory of mind. That is, to check if it ascribe a mental state to a person, understanding they might have motivations, thoughts etc. different from their own.

An answer like "Bob might actually like dogs, but struggles to express himself in a way that isn't interpreted as fake enthusiasm by Alice" would arguably be even better. It would show it's able to consider how Bob's thoughts might differ from the way his actions are perceived by others, thus going beyond just recognizing the expression "Great!" and the "when she's around" part as an expression of fake enthusiasm. One could check whether it's capable of providing this interpretation, by asking a follow up question like "Could it be that Bob really does like dogs?" and seeing how it answers.