Answer:

booer

Answer	Crossword Clue
BOOER	Expert in Bronx cheers
BOOER	Unhappy fan
BOOER	Heckler

BOOER	One who gives a hoot?
BOOER	Disappointed fan, maybe
BOOER	Unhappy spectator
BOOER	Sports spectator, at times
BOOER	Disenchanted fan
BOOER	Displeased spectator
BOOER	Source of raspberries, perhaps
BOOER	Unhappy and loud spectator

BOOER	Miffed fan
BOOER	Unhappy bleacherite, at times
BOOER	Bronx cheerer.
BOOER	Political heckler.
BOOER	Uninhibited critic.
BOOER	Frustrated fan.
BOOER	Heckler.
BOOER	One kind of fan

BOOER	Disapproving fan
BOOER	Angry fan
BOOER	One voicing displeasure
BOOER	Rude audience member
BOOER	Bronx cheerleader, e.g.
BOOER	Disenchanted fan, at times
BOOER	May be a Bronx cheerleader
BOOER	Uncool fan?

BOOER	One unhappy with a call
BOOER	One who's not a fan
BOOER	Rude one in an audience
BOOER	Rude person in the bleachers