Two conversations I've had in the last week deal with other people's comments about oneself. The question that arose is why do people think they have to comment on what others do. Is it just a need to say something, or do they really feel that you need their advice? Those who make personal comments don't realize that it comes off as "I'm better/smarter/wiser than you, so I'm going to tell you how to become more like me."
Some examples: "Boy, you sure like to eat." "You should dump that guy. He's no good for you."
"I notice you wear a lot of black. Do you know that makes you look old?"
Nice people (like me) usually smile and change the subject or say something mildly defensive, like "I like black." But what we THINK is, "SHUT UP!"