During his acceptance speech for Leading Actor for sexual assault allegations.
Towards the end of production on Bohemian Rhapsody, Singer was fired from the film. It was reported that he failed to report to set on several occasions - citing post-traumatic stress disorder from stress as his reason - and Malek had even complained about his experience with Singer on set. As a result, Fox ended up firing Singer from the film and replaced him with director Dexter Fletcher (several wins for his performance - there has been a significant amount of focus on Singer's affiliation with the film.
Related: Bryan Singer’s Bohemian Rhapsody BAFTA Nomination Suspended
After winning the BAFTA for Leading Actor, Malek gratefully accepted his award. He went on to thank BAFTA, Bohemian Rhapsody's producers, cast, and crew, the of Queen (who were present at the ceremony), and Queen's original frontman Freddie Mercury. However, Malek neglected to thank Singer, instead thanking Fletcher, the film's replacement director. Check out his speech below:
As for the BAFTAs, Malek was nominated alongside Bradly Cooper (come under fire after a controversial tweet resurfaced from one of the film's writers, Nick Vallelonga. This happened after the film had already divided audiences for its presentation of the film's real-life lead character, Dr. Don Shirley.
Though Malek didn't make a point to address the scandal surrounding Singer, neglecting to thank him during his speech spoke volumes about the entire situation. Earlier in awards season, Malek had not addressed the situation at all, which came under some scrutiny. That said, he did recently speak out about his experience with Singer, stating that it "was not pleasant at all." And, though he did not elaborate any further, perhaps the subtle approach of specifically not thanking Singer says more than saying anything at all.
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Source: BAFTA