There are two things in people that are signs of disbelief: defaming lineages and wailing over the dead

The Prophet (may Allah's peace and blessings be upon him) informs of two traits in people that are from the disbelievers' practices and from the morals of Jāhiliyyah (the pre-Islamic era of ignorance), which are: First: Defaming people's lineages, belittling them, and treating them arrogantly. Second: Raising the voice when a calamity strikes by way of expressing resentment at the divine decree or tearing clothes out of extreme discontent.