The people responsible for making the film couldn't even keep it straight what kind of film they were making. That's all.
Here is how many articles dealt with the movie as it was in production and even post-production: "upcoming Ghostbusters reboot/remake/reimagining."
This article nails down why longtime fans of the original disliked the idea of anything less than a continuation of the story. Even if a remake was accepted, it is unacceptable to have any original cast members as completely different characters from their original roles (as if they never existed). Meh. That's just ridiculous.
Geeks vs. Ghostbusters: The Most Controversial Remake of the Year
https://vergecampus.com/2016/05/ghostbusters-controversial-remake-2016/
I loved the original. Have watched it dozens of times. I enjoyed the remake.
Why is it unacceptable? IT'S A FRACKING MOVIE.