You just without a working suit Iron Man is pretty much useless. Cap told him in since the 1st Avengers movie what was up. Even challenged him in that movie, wanted him at his best so he told him to put on the suit.
This was the final outcome and Cap could of killed him easily at this point if he didn't regained his composure. If this was The Winter Soldier right now, Tony would of been dead.
In that whole scene in the avengers tony was sonning him mentally. Then when they did suit up Captain cupcake had 1 job to do while Tony saved the whole ship;but was getting worked by a bunch of goon #4's, in which Tony ended up saving him there too.
That scene you just showed, was after Tony was working chunky and Captain Kangaroo, Tony was about to blast captain planet until bunny grabbed him. That is the only way captain got the best of him.