This is such a great short but if you are watching it like you would watch "Santa Clause 2" then of course you won't get it. It's symbolic. Gerold is in a world where people are fake or playing a role and in order to be an accepted part of those societies, he has to play along but it's touchier. Red (like the red exit sign) and the red jumpsuit in particular along with the whole "The Delicious" thing is Gerald being real and authentic. He looks at the red exit sign as the work drones go on and on about something of no importance...he just wants to escape the droning.
At the party, he's about to lose it listening to the fake party small talk and like Clark Kent going into the phone booth and emerging as Superman, Gerald goes into the closet and emerges wearing The Delicious albeit under his clothes. Still, it gives him the power to quell the small talk and the fakeness.
How many times a day do I wish I could just start laughing at the office drones and shut them up with a "neny" "neny" finger pinching motion? A lot.
