It's Hayati
Week Five: Be Kind to Others
Abdullah ibn Amr reported: The Messenger of Allah (peace and blessings be upon him) said, "The merciful will be shown mercy by the Most Merciful. Be merciful to those on the earth and the One in the heavens will have mercy upon you."
- Source: Sunan At-Tirmidhi

This hadith is as self-explainable as it can get. The Most Merciful, as we know, is our one and only God, Allah (SWT). If you want to be shown mercy by the Most Merciful, do your part in being kind to others. It can be hard when others show arrogance or they feel too proud to be nice to you. But know that even a simple smile to those kinds of people is a way of being kind. :)