And after the alien invasion in downtown NYC (during fukking rush hour it looked like) that saw all sorts of devastation and one can only assume casualties, the Avengers went out to eat Middle Eastern food. Yet no one is whining about that.
And the reason for the invasion in case anyone forgot...Thor's brother. So basically half of New York gets destroyed because of Thor.
Oh...a strawman. Let's talk for a second before I undress your specific points. Why IS Avengers okay but Man of Steel not? What's essential when comparing the movies...is tone. What is the movie setting out to do and how well does it do within that vision? Avengers simply wants to be an action movie. It's a lighthearted romp that wasn't perfect but at the end of the day is legitimately fun and a notch above complete turn your brain off action.
Man of Steel wants to be an action DRAMA. It wants badly to be a real world take on Superman, however it has a director and a writer who think that Superman failing miserably in a grim, dark setting is the way to do that. It opens it up to a lot more scrutiny by way of the depth that it wants to have. It's the reason why TDKR is so criticized and holes are blown through that movie. Whether fairly or unfairly MoS IS held to a different standard, and unlike Avengers it compromises its hero very much by making the devastation seem so meaningless.
To get back to your specific points, you're forgetting what the Shwarma scene comes after. Numerous times during that battle in Avengers, they're shown doing something that Superman isn't. CARING for the pedestrians. Getting them out of harms way. Is there violence happening? Sure. Did some of those people likely not make it? Unfortunately not. But the effort to save them is conveyed BETTER in the lighthearted film than the movie that was attempting to have weight and as much realism as you could have in a movie like this.
Hawkeye saved people from a bus. Iron Man moves people out of harms way. Captain America takes a blast to his shield and falls out of a window onto a car because he's saving people. He takes over command from the NYPD to help herd people away. Iron Man establishes a perimeter to keep the damage contained. Iron Man almost dies saving the city from a nuke. In fact, if there's a criticism to be made its that the Chitauri look like pushovers and SAVING people looks like the real obstacle for them.
Then after all of this, you get a montage with people THANKFUL for their heroism. For the care and sensitivity they showed. So by the time you get to the Shwarma scene at the very end of the credits, they've earned the right to sit down and have a fukking meal. Is it lighthearted? Sure. But the human connection was done a lot better and again, it wasn't striving for the "realistic tone" Snyder wanted for his film so its not as detrimental.
But wait. If I recall correctly, isn't there a pissed off Senator or something mad at all of the destruction that The Avengers have caused during the ending montage? Saying they have to be held responsible? YUP. Aren't people during that montage arguing about whether or not the Avengers are a positive thing? Don't we have a SHIELD shadow counsel talking to Fury that doesn't trust them either? So the lack of trust that humanity should have when a superhero wrecks things IS addressed in Avengers. There goes your point about Loki...because at the end of if the film they AREN'T fully trusted despite having caused less devastation and clearly caring for people more than Superman. It's not addressed specifically as "man fukk Thor, he brought Loki here" (though even if it was, he's a part of a team so the other members would be exempt from the criticism) but its addressed.
With MoS you get...violence, a weird kiss where due to the gritty feel and lack of emotional connection, looks like its happening in the fukking apocalypse out of nowhere. More destruction, an odd moment of Clark caring for once that seems misplaced because it comes after a disregard for casualties and then...he's a dikk to the military about the whole thing. By that time I was way past caring. I was actually bored. In an effort to make the violence look real, Snyder forgot how to make everything else feel real. Perry White and female Jimmy Olsen were supposed to be supporting characters. lol they were fukking lifeless and undeveloped. And he took Superman away from the things that made him such an enduring character in favor of buildings fukking falling. AGAIN, cool if you wanted DBZ fights. With some people, all Superhero movies and comics in general are ARE the fights. But that's not the only reason i'm into this shyt.
TL;DR: Here, watch this. More weight and intelligence in conveying what's happening in a brief MONTAGE than in that whole fukking movie. fukk MoS, and erryone that loves it.