Many very wise people don't think it is. Whatever is begun in anger, ends in shame. So if you are angry consider how you are feeling. Try to see another point of view no matter how unreasonable it might be. Finally, turn the anger switch right off and feel a whole lot better.
Hatred is a prolonged anger towards a fellow human.
It probably doesn't cause the other person any harm, but it has a way of making us feel sick and depressed. Hatred is not helpful in any way. Hatred is self-punishment. There are various forms of hatred, motivated in different ways, and often without cause. Prejudice is the child of ignorance.