You know Simu Liu: star of Marvel's Shang-Chi and the Legend of the Ten Rings.

Though he grew up in Ontario, Canada, Simu was born in Harbin, China, and speaks fluent Mandarin.

So, safe to say Simu is definitely an authority on accurate Mandarin pronunciation and its portrayal in Hollywood.

Well, the other day Simu had some strong words for the Disney+ series, Moon Knight, which stars Oscar Isaac, Ethan Hawke, F. Murray Abraham, and the late Gaspard Ulliel.
View this video on YouTube
On Twitter, Simu wrote: "Alright Arthur Harrow needs to fire his Mandarin teacher" after the latest episode showed Ethan Hawke’s character, Arthur, speaking Mandarin.
Alright Arthur Harrow needs to fire his Mandarin teacher
Here is the scene, for reference.
Moon Knight has by far one of the worst attempts at Mandarin I’ve ever heard