A group of demonstrators gathered across the street from the Beverly Hilton Hotel to lodge their disapproval of the ceremony as the stars arrived on Sunday (January 15).
Plummer spoke to reporters about the protestors moments after he won the 'Best Supporting Actor' Award for Beginners.
"Gay characters are human beings. We're all exactly the same," Plummer said.
He continued: "Gays are part of our society and have been since the Egyptians, the Greeks; it is part of the human condition. I know there's an awful lot of anti-gay feeling right now, particularly at this moment, and I abhor it."
Gay Modern Family actor Jesse Tyler Ferguson also commented on the demonstrators while in the Golden Globes press room.
"I come from a long line of straight, white Republicans who don't like people like this. But even they like this show. In country clubs all across America, the doors are cracking open," Ferguson declared.
Modern Family took home the 'Best Television Series - Comedy Or Musical' Award on Sunday.
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Watch Christopher Plummer speak to the press following his Golden Globes win below: