To be honest, I think it has to do with the fanbase it created. Those FF VII fans can be some weird-ass people (lol). Also, FF VII is arguably one of the more popular entries in the franchise. For some reason, there's always a backlash when something becomes too popular.

I love this game. It isn't perfect by any means, mind you. There are glitches and translation errors almost everywhere you look, but its still overall a good game. It just has the misfortune of being the FF that changed FF games.