If you give unsolicited advice without trying to understand the person's actual needs then I think it shows you're not trying to help, but rather, you're trying to assert superiority. I have no time for that; life is way too short.
It is possible, of course, to select a representative from that equivalence class, and to use it to stand for the class as a whole. But this is, in a (categorical) sense, unnatural. I think this is the essence of what I had hoped to convey in my earlier misguided remarks.