1- one may not say negative , even if its true information ,
2- Even to only one person , it is forbidden. If there are more listeners it is worse.
3- Even if the subject is also present it is forbidden.
We learn how to evaluate our words - will they possibly hurt someones feelings ?
Will people feel more energized , happy , wholesome ?
The reason proper speech serves as an insurance policy for longevity is because it helps others live with energy & vitality.
Now may be a good time for a gem of Torah study.