The Cottagers ace is still bemused as to how the match officials contrived to award Tom Huddlestone's controversial strike at Craven Cottage.
Referee Mike Dean overruled a decision from his assistant during the second half of a keenly-fought London derby to hand Spurs a 2-1 win.
William Gallas was stood in an offside position as the ball sailed past him and into the net, leading to the flag being raised.
However, Dean, after consulting with his assistant, proceeded to give the goal and Tottenham all three points.
Greening insists that decision was farcical, with even the Spurs players unable to believe their luck.
"Most of the Tottenham players were laughing and saying 'if they give this now it's going to be a bit of a joke'," Greening said in the Fulham Chronicle.
"For one he was in an offside position and interfering with play. The linesman gave offside and I don't know why the ref tried to get involved really.
"Aaron Lennon admitted it was definitely offside, so I don't know what the referee saw."
Greening felt a 1-1 draw would have been a fairer reflection on the all-capital contest, with two evenly matched sides having cancelled each other out until Huddlestone's hotly-disputed winner.
He added: "It was an even game. We got a good goal and then were a bit sloppy to let them back into it straight away.
"They've come out strong in the second half, but at the end of the day, the referee's decision has killed us."