From a practical point of view, no matter what feelings someone has in his mind, we should treat him with good feelings. It may be that his behavior or conversation may not have any effect on us, but we should behave with him in such a way that our good behavior becomes effective on him. His behavior may change because positive energy is stronger than negative attitudes.
If we get upset with the unfair behavior of others and misbehave with them, then understand that our positive power has ended. We will not let this happen at all. Remember, we can overcome negative thinking by controlling our mind and emotions. With a positive attitude we can become masters of our emotions and mind.
For this we have to explain to our mind that if someone misbehaves with us then he is sick and suffering from disorders like jealousy, hatred and anger etc. We don't have to be like them at all. He is a person of kindness, compassion and helping, not of hatred and anger. We can treat it with good feelings only by keeping our mentality healthy and positive.
We can also win his heart. That is true victory and true service. We should not think that we have treated him well, yet he treats us badly. This reduces the power to do good. Doing good will increase our morale and inner strength. Therefore, it should be kept in mind that we have to do good to others in every situation.
If we do not do this, we will become victims of many types of evils. We will not be able to get the precious happiness that comes from doing good. 'Service to man is service to Narayan'. God is also pleased with those people who serve others selflessly and never shy away from doing good.