Hmm, my take was that the treatment of all the male characters in the movie had a strong undercurrent of “What would a movie be like if all the male characters were basically nothing but plot mechanisms and/or silly comic relief and gender stereotypes, and all the characters who get to be actual people with thoughts and feelings taken seriously were female?”
There are a shit-ton of movies out there (fewer nowadays than formerly, natch) where all the “actual people” characters are male, and female characters exist simply as a foil to them or background set dressing. Barbie swaps the genders in that style of filmmaking, and I suspect that that’s why some male viewers found it absolutely insulting and offensive. A fictional universe where no men get respected or taken seriously as individual human beings WHAAAAAAAAT. 
Mind you, I don’t think the movie was trying to imply that men shouldn’t be respected and taken seriously. It’s a parody. Moreover, it’s a sometimes-incoherent mix of parody and direct social critique, which IMHO is somewhat less effective than sticking with one or the other.
Still, very enjoyable movie, fresh and funny in a lot of ways. I’d probably say B+, but I am likely underrating it because, as I’ve noted, as a moviegoer I am crap at noticing or appreciating any of the artistic visual/cinematographic stuff that movies do, and I hear that Barbie was quite highly praised in that regard.