I'm not sure why, but when a green room actually is green, I get annoyed. It's like the painter was unsuccessfully trying to be clever. Even as I write this, I'm coming to the conclusion that if the room wasn't green, I probably be more annoyed at it being not green. Because now I know that painter was really an asshole.
I can just see him hanging out with his painter buddies, trying to convey the irony of how he just painted a comedy club's green room orange. They're all laughing it up, thinking he is the funniest person they've ever met in the painting industry. Then, over an after-work joint, they encourage him to do stand up, which he seriously considers. Fuck'n painters.