I have to admit I didn't even realise Ghostbusters *had* a 'fanbase' until then. I thought it was just a film people liked.
It was such a lightning rod for the feminist anti/feminist internet war for a while, but after everyone moved on to the next thing no one seems to have much good to say about it.
One backlash I'm certain was 99.99999% made up was the one against Mad Max Fury Road. That was literally just one idiot on an MRA website.