Not even Thanos and his beloved Infinity Gauntlet (complete with all of those previous Infinity Stones) would be out of reach.
I guess we tend to forget how important metal is to the plots of the Marvel Cinematic Universe movies.
Almost every single MCU hero uses metal in their costumes or weapons, and Bucky Barnes even has a metallic arm quite literally grafted to his body.
Beyond that, even The Incredible Hulk seems to recognize the fact that beating up an elderly Holocaust survivor is probably pretty bad optics for a superhero — particularly one who already has a history of collateral damage.