This is simply bs, sorry for being blunt. When you're conversing, sooner or later the topic will switch to professions. And there is no taboo in this area. As

This is simply bs, sorry for being blunt. When you're conversing, sooner or later the topic will switch to professions. And there is no taboo in this area. Asking a stranger about his occupation (esp. if the answer could be - judging by circumstances, appearance or whatever - that she/he has not been as lucky as you regarding jobs/skills) is considered impolite though.