"I mean, almost like calling Al Gore a climate change denier," Keaton told The Associated Press on Wednesday.
Keaton said he "made a mistake reading the teleprompter and the cue cards" when he conflated the titles of Hidden Figures and Fences at the awards ceremony Sunday. Both films have predominantly black casts.
Keaton said Wednesday that he is sorry for the error and feels especially bad for the makers of Hidden Figures for the flub that diminished the title's recognition at the show, where he introduced supporting actress nominee Octavia Spencer.
The Founder star said he's a longtime civil rights supporter who taught his son the importance of being socially conscious.