The single most unforgiveable thing I feel that was done with IM3 is that so far as I can tell everyone in that film seems to view the 10 rings as a new phenom in the life of Stark.
The 10 rings are responsible for the kidnapping of Stark in IM1.
They are the cause of him becoming Iron Man!
How can everyone forget this? Case in point when Tony and Rhodey are contemplating who this "new" threat is in the cafe.
This is the single most frustrating dismissal of continuity in all of the MCU and it could have easily been avoided, how does this get a pass?