Answer:

hater

Answer	Crossword Clue
HATER	One without a kind word to say
HATER	Curmudgeonly sort
HATER	One who's constantly talking smack

HATER	Constant critic
HATER	Sharp critic
HATER	Unceasing critic
HATER	Misanthrope
HATER	Hardly a yes man
HATER	Intolerant sort
HATER	Hardly a fan
HATER	Fan's opposite

HATER	One not pure of heart
HATER	Intolerant type
HATER	Bigot
HATER	Misogynist