Ah, the trusty straw-man: always key to a winning rebuttal.
Two differences: one, that was wiped from continuity for being the mistake it was. But, two: even before it was wiped, it involved a storyline of him "coming to terms with it" lasted for nearly a year's worth of stories across several books - all full of nuance and character growth, with "Exile" seen as one of the best Post-Crisis stories and setting up a number of future stories. They knew that IF Superman was going to do that, it had better mean something and have repercussions.
MoS Clark had a scream and a cry, and then was fine to joke in the very next scene - never to be addressed or talked about in any significant way again (at least by him). No fallout, no lesson, no character growth - nothing.
Speaking of all that, Batman'd been straight-up murdering people left and right because he just didn't care anymore - but it's ok now because he says he's better and promises not to do it anymore (after that first time just after his redemption where he did, we're just not going to count that, that gets a do-over), and we should all be fine with that. lol I mean, if we're really going for realism, what about repercussions for Batman? Is this where Snyder does his story about Batman going to prison and all about what he said would happen to Bruce in prison if he made a Batman movie?
I kid with all that, but even Snyder's movies require a hearty suspension of disbelief. There's a point where realism for it's own sake just sucks all the enjoyment out of a cinematic experience.