Pepper Potts, the love of your life just died a horrible fiery death Tony. At that point I want you to go full-blown Super Sayian 12 on Killian Tony because you failed to protect her Tony, remember !? That's what you said you'd do and Killian just took her from you, like that, just took her.
So then what are you calling your ridiculous malfunctioning piece of ***** armor to help you for then ? Of course it fails, and breaks into pieces. But no problemo, quick-2-quip Tony goes "Whatever". Remember, in Tony's mind Pepper still died a horrible death. Literally seconds ago.
So no, NOT "whatever" Tony, you go ape-***** because you failed to protect your woman and now your ridiculous and bumbling MK42 armor is preventing you from avenging her. You said you wanted to protect the one thing you can't live without. And THIS is how you intend to do it ?
But hey Tony, no worries ey, so long as you can get a few chuckles from the audience you'll sleep sound.
It's not The Mandarin Twist that bothers me, it's this kind of stuff that IM3 is littered with that really puts me off.
So yeah, the comedy is forced an inappropriate.