Balotelli, a half-time substitute for Lazar Markovic, had a quiet day after coming off the bench, until he raced onto a long ball in the 88th minute and slotted past Shay Given in the Villa net.
The flag was raised for offside, though, and the score remained 2-1 to Villa, ending Liverpool's hopes of claiming silverware.
Posted alongside a photo of the incident in question, Balotelli said "the picture says it all", before going on to congratulate Villa for their victory.
Balotelli has a history of controversial social media posts, having received a one-match ban for an Instagram entry in December that contained potentially offensive language referring to "ethnic origin and/or colour and/or race and/or nationality and/or religion or belief", before hitting out at critics in a strange video posted online in March.
