Even if you are friendly with the person giving the comment, it strikes me as a very self-centered thing to say. It translates into: "I don't like seeing your

Even if you are friendly with the person giving the comment, it strikes me as a very self-centered thing to say. It translates into: "I don't like seeing your face unhappy." To which I (or anyone) might reply: "Well, I'm having a shit day and you're not helping. So... tough!" It would be more appropriate to say nothing if you don't know the person or don't have time to ask if anything is the matter.