A person that segregates potato’s based on color in a pan or how they eat them and decides the quality of said potatoes by color this is potato racism
You are a potatoist a racist against potato's
mis-labeling a potato
or
refusing to acknowledge that there are different types of potatoes
basically, you are being racist to a potato.
"You look like a potato!"
"Excuse me, potatoes come in different colors. You are being potatoist right now!"