It's not just Snyder fans/bros. A lot of comic book Superman fans and pages (even Reeve fans) that I have seen and are apart of with thousands of members and hundreds of comments about 'Superman' are split as well. This is not going to change and the discourse is here to stay.
These same trades called Snyder fans "bots" and have attacked that fanbase on more than one occasion, ad-nauseum. Nobody is holier than thou in this fanbase medium. Snyder fans took their fair share of slugs to the face and are they way they are for a reason (and everyone knows it).
What needs to happen is the general audience needs to latch onto this film, families need to get in the theater, and those same families need to recommend a good word of mouth to other families to create a new audience for the reboot. A good movie will drown out the BS, but it's never going to go away. Not in this modern age.