"I appreciate that people are writing characters that are interesting and unusual, rather than some bland female character as the girlfriend in a movie, but when the point of the character in this movie is to, like, help the guy have his arc, that's sort of the problem, and that's why it's good that they're talking about it, because it certainly is a troubling trope."
There's just one problem: The Internet is super dumb.
How We Ruined It
The biggest misunderstanding surrounding Rabin's criticism is that it describes any kooky female character. That's why Diane Keaton in Annie Hall and Katharine Hepburn in Bringing Up Baby and Maria Rainer in The Sound of Music have been called "Manic Pixie Dream Girls." You may as well say that Sally Albright from When Harry Met Sally is one, too. And Marge Gunderson from Fargo, because she's got a funny accent. Or you could acknowledge that giving a female character some distinguishing traits is actually just what writing is.
For Pete's sake.
Imagine the person who thinks like this. They read blog posts, pick out buzzwords, excitedly repeat them all day, and then confuse that with actual thought. They don't actually care about context or nuance so much as they do gathering trend-credit for using this shiny new term. "Belle from Beauty And The Beast?" they ask sweetly. "Ever notice how she has fun that one time and let helps Beast grow as a person? Why, she's nothing but a stupid Panic Mixie Dream Person!"
Incidentally, this is exactly why Rabin apologized for inventing the term. His idea had been murdered by stupid people.