According to a hadith: كَفَى بِالْمَرْءِ كَذِبًا أَنْ يُحَدِّثَ بِكُلِّ مَا سَمِعَ (It is enough for a person to be a liar if he says everything he hears) (Musnad al-Bazzar 8201) If you listen to a person who doesn’t do as it is reporting, he either exaggerates or plays down, and you repeat what he says,  then this is a grave sin in Islam. Either you should remain quiet and mind your own business, meaning you should become indifferent. This is one option before you. The second option is to do scrutiny. The third option is to repeat whatever you hear. This impermissible in Islam. More than 90% people take the third option. It is unlawful in Islam.

You have only two lawful options: either remain indifferent or do scrutiny and try to understand the real matter. You don’t have the third option to simply repeat what you hear. If you do so, the hadith describes this as: It is enough for a person to be a liar if he says everything he hears. It is enough for a person to be a liar if he says everything he hears. Such a person is a liar in God's eyes. One who takes the third option becomes a liar in God's eyes. This is a very serious matter.

People generally narrate whatever they hear. This is indeed a very serious matter. When it comes to a misunderstanding, there are two parties involved: one who develops a misunderstanding, and gives place to negativity in his heart about a person. The second is the person against whom negativity or misunderstanding was spread. One is a person who develops a misunderstanding and the other is one about whom misunderstanding was spread. There are two parties. It is a duty of the first party to scrutinize, investigate and only then speak; otherwise he should not speak. The hadith says: وَمَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَاليَوْمِ الآخِرِ فَلْيَقُلْ خَيْرًا أَوْ لِيَصْمُتْ  (One who has fear of God must say what is right or remain silent) (Sahih al-Bukhari 6018) You should speak in an as it is manner. A person has only these two options.