The Chelsea interim boss claimed he was waiting to greet Ferguson in front of his dugout before the game but the Manchester United manager ignored him.
Benitez said: “I was waiting at the beginning. I was ready and waiting and he just walked past. I have education and know what I have to do. You’ll have to ask him why he did not do it.”
Benitez responded to his early snub by walking away from Fergie at the end of yesterday’s 2-2 FA Cup quarter-final draw rather than offer his hand.
Asked why he did not wait for Ferguson at the end of the game, Benitez said: “I went to be with my players.”
Chelsea had fought back from 2-0 down yesterday to earn a replay and could have won it at the end but for a fantastic save from David De Gea.
Rio Ferdinand could be in hot water for tripping and shoving Fernando Torres in one movement — and then yanking the Chelsea player to his feet.
The 85th-minute incident was missed by referee Howard Webb but the FA could still take action.
The date of the replay at Stamford Bridge is yet to be decided, with the winners facing Manchester City in the semi-final at Wembley.