Why am I surprised, it is Hollywood.
If you wanna know how bad it is and you aren't planning watching it, then feel free to open the spoilers.
So apparently Ken is the ultimate villain in this film. Barbie and Ken somehow manage to travel to LA from Barbieland where Ken learns about real world's patriarchy and he then goes back to Barbieland and persuades other Kens to start a revolution and establish patriarchy. But they ultimately get defeated and Barbies regain their power.
Additionally the "real world patriarchy" mentioned here is also apparently a very cartoonishly exaggerated version of patriarchy, like Barbie literally getting instantly cat called as soon as she arrives, all the men she meets being evil and etc"