Balotelli started his career with Inter before a turbulent spell in England with Manchester City and returned to the city in January when AC Milan signed him.
Newspaper Gazzetta dello Sport were among those to report that inflatable bananas were being waved by Inter supports during the 1-1 draw.
Balotelli was also seen to raise his finger to his lips in an apparent bid to silence his detractors.
That was the second time Balotelli has been the victim of racism on his return to Italy.
The first saw AC Milan vice-president Paolo Berlusconi - the younger brother of club owner Silvio - filmed at a political meeting in Monza near Milan describing Balotelli as "negretto della famiglia" - translated as "the family's little n****".
That led to accusations of hypocrisy at the Rossoneri just four weeks after Silvio Berlusconi praised midfielder Kevin-Prince Boateng for walking off the pitch after he was racially abused during a friendly against Pro Patria.