This post:
You said it perfectly. If Back to the Future (also my favorite movie) were remade, I just wouldn't watch it unless it looked like it did justice to the original and was a new take that spoke to me. If its not, oh well. Maybe it speaks to someone else in the same way that the original speaks to me. It doesn't mean my perception of it as a bad movie is wrong. It doesn't mean someone else's perception of it as a good movie is right. It just is what it is.
It doesn't mean no one should ever try to remake it. A remake could be brilliant. This movie (Ghostbusters 2016) might speak to an entire generation of movie goers the way Ghostbusters did. 30 years from now, there may be a group up in arms over the all male remake of Ghostbusters 2016. If it does. Good, its done its job, it was worth remaking. If it doesn't, if it is just a bad movie that bombs, it hasn't done its job. But that doesn't mean Ghostbusters in and of itself can never be worth remaking.
Either way, no harm no foul. The original is still there. I'd venture to say it sits on the DVD shelf of nearly every person in this thread. Unless Kristen Wiig and Melissa McCarthy are breaking into your homes and stealing every copy of the original Ghostbusters, then this movie changes nothing.
At any rate, its hardly worth the level of rage you describe.