Yea i agree with others here. In my experience people dont do well with vague questions esp with strangers. If you were asked that you may feel intruded upon or surprised / not sure how to answer the question. Same reason this question causes so much stress for interviewees - how do you select the best points, in the right conciseness? You are wondering what the other person is interested in, and you dont know shit about them. This situation is even compounded because it’s unlikely you expect this question and you know even less about the person.