Hemingway was often poor at writing female characters, but I wouldn't describe them as boys disguised as girls. And there's always the exception like, Hills Like White Elephants.
I think Fitzgerald usually does a great job with female characters. Perhaps Daisy Buchanan is the most memorable female character in U.S. literature since Hester Prynne?
I didn’t say that I believed it, I said it had been theorized by a literary critic. I suggest you read his book(s) before dismissing his ideas. Leslie Fiedler, “Love and Death in the American Novel”.
For my part, I don’t care for either Fitzgerald or Hemingway.
God no, Daisy Buchanan is barely even a character. Daisy Miller is much more substanial, as is Isabel Archer.