Originally Posted by
EarlVolFan
A receipt should have popped out of the boarding pass scanner with his correct seating assignment when he presented his 2A boarding pass to the gate agent as he was boarding, shouldn't it?!
Yes, although when a bunch of people are boarding at once, the person getting the printed little seat receipt can be in the jetway before the paper pops out of the printer and by then it can be unclear to whom it belongs. This was my experience when I played GA for the day at the DL ATL DO.
The GA might have offloaded the OP in anticipation of him misconnecting and then failed to notice that he boarded before upgrading the OP into 2A.
Unless the OP saw the email that Mr 2A claimed to have confirming his upgrade, I would be suspicious that he may have made that up in an attempt to keep 2A.