They saw decisions like this even themselves out over a season, well they had plenty of dubious ones earlier in the season so there you go.
I still can not be 100% sure whose arm it touched first but am leaning more so to the Chelsea player, I can see why they are upset and the alleged comments from the ref won't help.
But then again, fuck them.
It's not a penalty.
The pressure they are trying to put on the referee should be punished by the FA
The referee should be applauded.