The whole gender bender subplot was a big "WTF!?"
The whole story arc with Max being turned into a girl, while not bad per se, it was just some of the weirdest shit I've ever seen in a Disney sitcom. To be honest, I'm very mixed on the gender bender stuff. It's the bully cliché that I actually hate with a burning passion, especially if the bully/bullies are written as generic one note villains. But the gender bender stuff isn't nearly as bad and I can't say that I actually hate it. The bodyswap stuff with a male and a female is more bearable, but the "Ranma 1/2" gender bender stuff is way more annoying.
It's been over 13 years, but didn't that arc last like 4 or 5 episodes IIRC? I wonder if WBWP is going to have a similar subplot, if not a rehash of the Maxine one. Reminds me of when The Fairly Oddparents did that one episode where Timmy accidently got turned into a girl for almost the entire episode.