Why are people so excited about this? I say this as someone who thought the original Justice League was...fine. Not great, didn't feel like a waste of time.
The urge for a conspiracy theory that would explain why the film wasn't awesome is the only thing that makes sense to me.
Especially given the internet fandom of DC comics overlaps a lot with the toxic online culture in video games which has done similar things over other really weird stuff. (FF VII remake, Pokemon, etc)
Don’t forget MCU fans and their harassing of directors because they shared a slightly unfavorable opinion of the movies.