Answer:

ARETOO

Answer	Crossword Clue
ARETOO	Playground retort
ARETOO	Response to "Am not!"
ARETOO	Schoolyard argument retort

ARETOO	Playground rejoinder
ARETOO	Playground response
ARETOO	"Am not!" retort
ARETOO	Childish retort
ARETOO	Playground comeback
ARETOO	Schoolyard comeback
ARETOO	Schoolyard retort
ARETOO	Bit of schoolyard backtalk

ARETOO	Reply to "Am not!"
ARETOO	Stubborn comeback
ARETOO	Childish comeback
ARETOO	"Am not!" comeback
ARETOO	"Am not!" reply
ARETOO	"Am not!" rejoinder
ARETOO	"Am not!" response
ARETOO	Reply to someone in denial

ARETOO	Childish answer
ARETOO	Kid's rejoinder
ARETOO	Playground surrebuttal
ARETOO	'Am not!' comeback
ARETOO	Retort to 'Am not!'
ARETOO	"That is indeed true of you," in kid-speak
ARETOO	Denial to a denial