Anone who thinks it's man hating hasn't actually seen the movie. It has as much to say about the state of modern men as it does women.
At the start of the film it plainly states, out loud, in actual dialog, that for Barbie, every day is the best day ever, but for Ken, it's only a good day if Barbie looks at him.
Ken's adrift. He's the ultimate representation of a friendzoned incel. He has no purpose in life other than as a Barbie accessory with as much agency as her swimming pool or Dream Car.
When he finds that purpose, it's toxic. But saying the film is "man hating" is denying Ken's search for meaning in a Barbie world.