A lot of it comes down to Snyder's lack of awareness and subtlety when it comes to the optics of the situations Superman is in.
Like, Superman, I'm glad you're fine, but you could have just stopped that truck. Now that building is ruined. Do you not care about collateral damage??
Yeah Superman, that guy was a huge scummy douchebag but geez, that comes off more as anger issues than being chivilrous. I'm not sure destroying a man's livelihood is exactly fair punishment.
That scene always came off as bad for me because, well, what is he trying to say? Is he showing off? Is he angry and went too far? Either way it actually comes across more disturbed than heroic.
It's more sight gag and comeuppance than anything, I get it, but it has really unfortunate implications.
Overall, Snyder's Superman comes off as a genuinely unstable person. I wouldn't, and don't, trust him.
Not enough was done to make him truely heroic. He's more a force of nature with questionable morality.