wanton love

One who is full of himself fills all the space around him. There is no room left for anyone else. Therefore, he despises another person by virtue of the space that other person consumes. He may give reasons for his disdain, but the reasons are secondary.
This is called wanton hatred. It is the reason given for our exile. It is the core of all evil. It is balanced and cured by wanton acts of love and kindness.
Taken from chabad.org