The 27-year-old played down any suggestion that he will carry a grudge into Friday's game in Sapporo, but admitted the incident with Simeone had a considerable effect on his career.
"It has changed me as a person and a footballer," said Beckham. "What has been the most rewarding thing for me though has been winning the people over through my football and on the pitch.
"I could have done interview after interview, explaining myself and talking my way round it. But I've just gone out there and worked hard to get to where I am today.
"And I have worked hard at that. It's just been an amazing turnaround for me over the past four years."
But for all the talk of forgetting that night in St Etienne, Beckham was still relieved to hear that the suggestion that Kim Milton Nielsen would again be the referee had been a joke.
"Don't do that to me!" he said, adding a word of praise for Italian Pierluigi Coillina, the actual match official: "Collina is the best referee in the world."