What a crock of shit. This wasn't the complaint you started with, you began by trying to argue the plot points didn't even make sense to begin with. And now that people have explained what was obvious to everyone else but you, you're moving goal posts. Again. Just like I said you would.
But here's the real shit in your cereal. The levity of the airport fight scene you're bitching about absolutely, without question is an intentional story telling device. Yes, to most of those involved, it almost felt like a sparring match. Most of them felt like they were pulling some punches. The audience gets caught up in the fun of the moment too. But then what happens? How does this fight end? Rhodey gets shot unintentionally (which is a REALLY IMPORTANT DETAIL BTW) and falls like a rock for what feels like at least half a minute. And instead of being caught at the end like the film had lead you to believe woould happen, he lands with a deafening thud. I can't tell you the last time I've heard the theater wince that audibly. For all the insane action in Fury Road, there isn't a single blow in that entire film that hits with that much impact.
That's because the Russos intentionally cut the rug out from under the audience. Instead of everyone continuing to smile and laugh at how much fun they had, everyone immediately comes down to earth. Rhodey is fucking crippled by collateral damage. And instead of just dying, which would be emotionally lazy, Rhodey is now a living, limping, constant reminder to Tony of the consequences of the superhero community running around unchecked. The tool he created is responsible no less, which is a running theme Tony has been struggling with since the first Iron Man, i.e. the start of the MCU.
So despite you being unable to see these really obvious narrative threads, the lighter tone of the airport fight is entirely deliberate from a story telling point of view. Not only that but it was goddamn necessary to drive the point home that the Avengers operating in any capacity carries with it with it enormous risks, regardless of how much fun the audience has watching them.
Now that I've explained to you why it works from a story telling perspective, and you yourself have admitted in your own post that the plot mechanics work, feel free to move the goal post yet again.