Quotes / Colorblind Confusion

Finn: Check out this ruby I got.
Jake: That's an emerald, dude.
Finn: You too now?! Emeralds are green, boyee.
Jake: This thing is green.
Finn: Why is everybody messin' with me? It's like a dark gray-ish red. Mostly gray. Sometimes red things are gray!
Jake: You're a little colorblind... and there's nothin' to be ashamed of!
Finn: Oh... whoops.

—Adventure Time, "Red Starved"