Why are teachers mean to boys?

There are various psychological and environmental factors responsible for why some people are mean. The most important factor is experience.

Most people are born good and humble, but due to some bad experiences like betrayal from loved ones and too much stress make them mean, in which they feel comfortable.

Another reason may be the influence of a person one really loves or appreciates. We learn things usually by imitation. This is why children walk like either of their parents. The accent of speaking matches, etc. An American brought up in India or China will not speak in the usual American tone and vice versa. The same reason of imitation is responsible for being kind or mean also. If a child is much attached to one's mother and the mother is mean, the child imitates her behavior and becomes mean to his/her friends, which continues until he improves upon it.

As far as remedies are concerned, the actual reason of this activity or the history of the patient should be investigated. After this the person should be brought up in an environment where very few mean people are present. This will help him improve upon his attitude and transform his mean nature to a kind and humble nature.