People can easily be mean. Sometimes they don't notice that they are rude or inconsiderate, because they don't take the time to realize it. Humans are inherently capable of being cruel. Some people don't care how they treat others.
But just because other people are mean, that doesn't mean you have to be. Don't be a hater. Be nicer than the haters. The haters will try to bring you down.
Have the strength to be the better person - to be the nicer one - even when people treat you badly. You've probably heard the saying, "Kill them with kindness." Not literally, but kill their meanness with your ability to fight back with goodness, and don't let their cruel remarks get you down. Don't waste your energy feeling upset about their lack of compassion for others.
Being nice to people will put you in a better mood. Seeing your smile and "hello" could make someone's day a little brighter, and maybe even make them smile too. It will help your day become even more positive than you have tried to make it be.
You have the capability inside of you to be a kind human being. You are able to show compassion for others, and understand that they might have a hard time changing who they are.
If you get to this point in this article and realize that you are the "hater" that I've mentioned, it's never too late to change. You can act differently towards other people, and show them that there IS good in the world. Sometimes it's hard to see, but good exists.
You can create good in the world. You are capable of being the good that you wish to see in the world.
Be the better person. You and I both know you can.