Put-down artist

• One who degrades
• Bully, often
• Shame is his game
• Belittling one
• One who humiliates
• Degrading sort
• One putting others down

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Abaser \A*bas"er\ ([.a]*b[=a]s"[~e]r), n. He who, or that which, abases.

Wiktionary Word definitions in Wiktionary
n. One who, or that which, abases. (Late 16 th century.) (R:SOED5: page=2)