Answer: rubsitin

AnswerCrossword Clue
RUBSITIN

Gloats

RUBSITIN

Adds insult to injury

RUBSITIN

Cries "nyah nyah nyah!"

RUBSITIN
Harps upon another's failures: Slang.
RUBSITIN
Adds insult to injury, say
RUBSITINAdds salt?
RUBSITINAdds salt to a wound
RUBSITINGloats and then some