Yesterday I was talking with a co-worker from another department. I see her everyday, and we talk everyday. At a certain point I said: "You look tired today." As soon as I said it, another woman nearby jumped in and told me that "it's offensive, and quite rude to tell a woman that she look tired. Tell it to other men, but not to women." So, is it rude to tell a woman that she looks tired? (When, indeed, she does).