The Inter coach, who was sent off himself, was enraged by a number of decision in his side's 3-0 defeat the the Giuseppe Meazza.
Roberto Mancini branded referee Antonio Damato and his fellow officials "a disaster" after watching his Inter side lose 3-0 to AC Milan on Sunday.
Mancini was sent to the stands by Damato early in the second half at San Siro for fiercely protesting a decision not to award a penalty after Inter debutant Eder collided with opposing goalkeeper Gianluigi Donnarumma in the area.
The Inter boss also appeared to raise his middle finger to Milan fans as he left the dug-outs.