It is not okay to brag
Jan's friend is talking to her about the new purse she bought, but Jan's purse is much more expensive.
Jan wants to compare her friend's purse to hers.
Jan tells her friend that she likes her purse more than her own.
Jan tells her friend that her purse is so much nicer than Jan's.
Jan's friend gains confidence in her purchasing decisions and feels that Jan is modest.
Jan's friend feels insecure and feels that Jan thinks she's better than her.