Keep calm and carry on. When you encounter difficult people, be a peacemaker. If you are a hot-tempered person, you will cause a lot of troubles around. But, if you are slow to anger and patient, you can calm disputes.
You will also appear contented if you don't lose temper that much. Show love to that person instead of hating back. It is okay to be angry, but in your anger, do not sin (Eph. 4:26). Handle temper carefully so that it will not stumble others.