After all that is not the only thing in the whole world. In other words, we should learn to live a life where it is all right whether we get what we like or not. Every now and then, we may come across a situation where we do not like something. Most of the time we can ignore that, but sometimes it develops into the hatred towards someone. If the hatred is due to the loss of something, then it can turn into anger and may cause harm to others and to us.
Hatred brings enmity.
Instead, we should develop love and friendship for everybody. Even if someone is cruel to us, we should show compassion.