He loved to pronounce a curse— may it come back on him. He found no pleasure in blessing— may it be far from him.
OJBAs he loved kelalah (cursing), so it came on him; as he delighted not in brocha (blessing), so it was far from him.
T4THe liked to curse people. So cause those terrible things that he requested to happen to others to happen to him! He did not want to bless others, so cause that no one will bless him!