You entirely missed the point of the example. The point is not that you are supposed to embrace their beliefs. The point is that object that are all alike in one system can be very different in another, and if you assume they are all alike, you will misunderstand what is going on. Such as, if you assume that empty string is just "nothing", you will misunderstand how strings - and in general, typed sequences - work in most programming languages.

It's like a bad student that when the teacher says "assume the train departs from the station at 9 am", to formulate a math problem, objects "but the train actually departs from our station at 10am!". Way to miss the point!