The writer/producer talked about Margot Robbie and Greta Gerwig getting snubbed for Best Actress and Best Director respectively in an interview with People ... and insisted she'd give back her Academy Award for penning "Juno" if she'd get a "Barbie"-level box office return.

DC basically told the mag that of course Margot and Greta got snubbed ... but who cares about that when you just made 10 figures at the box office -- before adding she'd "trade my Oscar for a billion-dollar movie right now, if I could flip a switch!"

Cody said she meant to disrespect to the Academy ... though it kinda felt like saying "no offense" after you've low-key shaded a friend if we're being honest. But, let's be real -- a ton of stars would make that deal for a billion-dollar movie.

Another interesting note ... Diablo took a stance similar to a lot of people online -- mainly that both Robbie and Gerwig got nominated in other categories -- so not a total snub for either star.

To be fair, Cody's a bit of an expert in this field ... 'cause she worked on the "Barbie" project that was meant to star Amy Schumer way back in the day -- though hers never quite got off the ground, saying it's a hard IP to make believable.

Still, lots of fans are outraged at MR and GG getting left out of their biggest categories ... with some calling the voting sexist and even celeb fans like Hillary Clinton weighing in.

Welp, it seems there's only one way to settle this ... vote below!