A person who works in a Subshop. More than likely, a person who puts up with large variables of bull shit from snobby customers throughout his/her work shift.
Something like a Barista, just subs instead.
The Bolognarista had to explain that the $5.00 sub was just a promotion but the rude customer demanded to have it for the discount price anyways... When the customer was told they couldn't give them the discounted price, they demanded their fuel refunded, when the customer was told they couldn't have the fuel refunded, they threatened lawyers and then stormed out of the store.