Baiter
The Century Dictionary and Cyclopedia
noun.
One who baits or worries (animals); hence, a tormentor; a tease.
the GNU version of the Collaborative International Dictionary of English
noun.
One who baits; a tormentor.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
Agent noun
of
bait
; one who baits, as with a
fishhook
.
noun.
A
troll
who deliberately posts aggravating messages on a
message board
to elicit responses.