Snyder setting the two up to be enemies so that they fight? Bullshit. The two are friends, brothers in arms, and that is exactly why their fights matter. They are friends because they are both good, and they both believe in most of the same things. But they believe in mutually exclusive routes to that justice. And they’re both right and they’re both wrong.
Good Batman and Superman stories set it up so that neither of them is right, so that they are both the causes of and solutions to the problems that exist. Snyder has no sense of that nuance, and that trailer really drove home just how little concept he has of these two characters.