I don't necessarily agree with this. The other guy got what he paid for, RWYA is asking to get what he paid for. A policy of paid F tickets getting priority on meal choice, especially given the fact that we know they don't cater enough of many options, makes sense (even though it's clearly NOT the current policy)
This I totally 100% agree with. Making a scene in front of the other passenger is way over the line. If he had a problem he needs to address it with the FA in the galley and mostly he needs to take it up with DL corporate instead of dragging an innocent passenger into it.
Plus it's really creepy to like keep track of everyone in F and figure out who's on an upgrade.
And totally against Delta policy for the employee providing him that information.....no matter how they communicate.