Plenty of movies are made every year that feature or star mainly women and don't get hated on for it.
Nobody hated on Mad Max for having a strong female presence.
Hollywood thinks they can take old IPs and just replace the male characters with female equivalents but with minimal effort into the rest of the movie, and that audiences will just lap it up.
Like if they remade the Charlie's Angels movies and gave Charlie a female voice, and turned the angels into men, would you watch that? It they turned Bosley into a bumbling female idiot, do you think that would be well received?
If they remade the Pretty Woman movie and turned Julia Roberts into a gay escort, do you think that would do well?
If they made a Wonder Man movie, because they don't think audiences would buy the notion that a woman can be a super hero? Would you be ok with that?
What Hollywood is doing is tired and insulting. Sure some trolls are having fun with that, but don't dismiss the broader message of the movement just because of one or two bad apples.