What is "katagelasticism"

Katagelasticism is a psychological condition in which a person excessively enjoys laughing at others (coined by Christian F. Hempelmann and Sean Harrigan from καταγελαστής (katagelastēs), Ancient Greek for “mocker”). Katagelasticists actively seek and establish situations in which they can laugh at others (at the expense of these people). There is a broad variety of things that katagelasticists would do—starting from harmless pranks or word plays to truly embarrassing and even harmful, mean-spirited jokes. They would be of the opinion that laughing at others is part of the daily life and if others do not like being laughed at, they should just fight back. For the katagelasticists it is fun laughing at others and there is almost nothing that might hinder them from doing so. For them, some people even might provoke getting laughed at (and surely deserve being laughed at). This condition often makes it difficult for sufferers to gain and maintain acquaintances and boy-/girlfriends.