I can honestly say that I had never heard that phrase used before now, but I do know I felt icky when I read it in the comment before I even clicked on your link. Definitely glad to see it is being called out, terms like this absolutely need to be removed from modern discourse.
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Some detail about that phrase https://www.catalyst.org/2021/03/22/racism-misogyny-asian-am...
Pretty sure the phrase GP was looking for was "pull back the curtain", which likely originated with The Wizard of Oz.
I can honestly say that I had never heard that phrase used before now, but I do know I felt icky when I read it in the comment before I even clicked on your link. Definitely glad to see it is being called out, terms like this absolutely need to be removed from modern discourse.