Color blind people, normally do not like to be 'tested' by having to identify colors. Some people will ask about an obvious color (i.e; a person's skin color) and accuse the color blind individual of faking this sight deficiency.
Some people have also learned to some what force themselves to see a color by substituting it in their mind. For example, a colorblind person may see the grass as a reddish color, but think of a green color and merge it into their sight.
Allison(With a white shirt) : Todd what color is my shirt?!
Todd(Thinking it must be white) : White.
Allison: You're not color blind! Faker!
"You don't understand... I'm Color Blind"
"How is it that you colored the sun green, the ocean purple, but managed to get the rainbow perfect?"
"I'm color blind"