Here's my thing and I'll be as broad as I can be because I don't think this board is the only place it can happen. Fans are passionate people, and a lot of times these characters or franchises take on something of a personal feeling, that requires defending. That if someone comes out it from a different point of view then it complete ignores history, what a thing "should" be, etc. Add in the anonymity factor of the Internet and it creates a powder keg that can devolve in to personal insults, extreme language and vile rhetoric rather quickly.
I get the passion for iconic figures like Superman. I get that Snyder's films are controversial. But, no where in his films was Superman ruined, because, as has been noted multiple times in this thread Superman (and the other characters) all have a long history. And that means that different iterations are allowed to be produced without ever taking away from past productions.
