If you practice the ignorant (arrogant) mind, you start to dislike everyone. An ignorant mind is an unhealthy mind, and it is a source of disaster, misfortune, and no wisdom. It presents darkness to the mind and sufferings to the body. An ignorant person treats himself like his own enemy.
Instead, see everyone as a Buddha. You will discover many of Buddha's actions from these numerous future Buddhas, and you will be able to learn from them.— Jae Woong Kim, Polishing the Diamond, Enlightening the Mind by Jae Woong Kim, Yoon Sang Han, translator