I found this online. I don't know why but I laughed so hard at the "rude" example.
SCENARIO: Your friend is in a crowded dressing room at a department store trying on an outfit for an upcoming date. She comes out of the dressing room in a dress that highlights her backfat, rolls and love handles and the color of the dress makes her look sallow and sickly.
FRANK: That dress isn't very flattering. Try the other one.
TACTLESS: That dress makes you look fat as hell and the color makes you look like you are about to die of dysentery. Take that ugly sh*t off before someone else sees you!
Thread: Being frank vs Being rude