"What if it is red?"
prove it
YOU: To me its like saying "I say this color is red, if you don't believe its red then you are ignorant."
ME: "What if it is red?"
YOU: prove it
Depends on what your definition of red is doesn't it? If it's an objective physical measurement, then it can be demonstrated the light reflected from the 'red' object is of wavelengths defined as 'red'. But if you subjectively insist that what is defined as red is not red, then you are at a minimum ignorant (in the strict sense of the word) of what the objective definition of red is. In this case, no 'proof' is sufficient. If you are aware of what the objective definition of what red is but insist you disagree with that definition because you have some other definition of red, then you are ignorant of what language is used for. Or you are just argumentative, which is a form of ignorance all its own,