Some might think that a pilot could reasonably get upset with a ground controller who has just cleared his flight to push back into the path of another aircraft, prevented only by a vigilant tug crew.
Except that Nigel didn't get upset, he simply pointed out calmly to the oblivious controller what had happened and informed her, not unreasonably, that he would be filing an ASR.
Or have I been listening to a different recording?
You missed the part where she said she tried to notify them of the other aircraft and they acknowledged they weren't listening out on frequency.