It might be Parisian indifference or the person might really not know, but the chief reason for the lack of response would probably be that the question displays so much ignorance in and of itself that the person doesn't know how to begin giving an answer.
或許這就是巴黎式冷漠，或許他真的不知道，但最主要的原因還是﹘﹘這個問題太「外行」了，「外行」到別人無從答起，解釋起來又太費周章，乾脆相應不理。