Gaten, 14 – who plays Dustin in the Netflix series – said that Winona, 45 – who plays Joyce in the drama – discussed the whole thing as he jetted out of LAX Airport on Monday.
The young actor told TMZ: "Oh I think it's because she couldn't hear what David was saying."
However, when asked if he thought David's political comments overshadowed the speech in general, Gaten insisted: "No, no. I think we were all just so happy to be with each other – it was just a great time. Yeah, it was awesome."
Gaten Matarazzo has spoken out about Winona Ryder's bizarre facial expressions
Gaten discussed the whole thing as he was seen leaving LAX
I think it's because she couldn't hear what David was saying.
Gaten Matarazzo talks Winona Ryder's facial expressions
David – who plays Chief of Police Jim Hopper in Stranger Things – had everybody on their feet as he led the team's acceptance speech.
Taking to the stage, he looked as though he was about to break down as he delivered one of the most inspiring monologues of the ceremony.
Clutching onto the award, he told the crowd: "On behalf of this fearless and talented cast we'd like to thank Netflix."
David Harbour led the Stranger Things cast's acceptance speech
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Stranger Things won the Best Ensemble Drama gong at Sunday night's ceremony
SAG Awards 2017: Winners
Mon, January 30, 2017
SAG Awards are often seen as the true precursor to the Academy Awards and it was Fences that came out on top in a surprise triumph over La La Land. Take a look at this year's winners.
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He continued: "I would just like to say that in light of all that is going on in the world today, it is difficult to celebrate the already celebrated Stranger Things.
"But, this award from you, who take your craft so seriously and earnestly believe, like me, that great acting can change the world, is a call to arms to our fellow craftsmen and women to go deeper.
"And, through our art, to battle against fear, self-centredness and exclusivity of our predominantly narcissistic culture, and through our craft, to create more empathetic and understanding society by revealing intimate truths that serve as a forceful remind to folks that when they feel broken and tired, they are not alone."