Stupidity

Ignorant is basically the same thing, lol. Sometimes people make wrong choices doesn't mean they're ignorant or stupid, it just means they made a wrong choice and they shouldn't be looked down upon.

Well, let me elaborate my thought a little bit further, since my quote above was roughly translated using Google (English is not my native language)... This is the scenario:

Max, who is 20 years old and a college-student with the typical attitude that college-students have, asks Tom, who is 40 years old, to calculate 1+1.
Tom says he does not know how to do that, the reaction of Max is simple: He calls Tom stupid, because Tom is a 40 year old man but doesn't even
know the most simple mathematics. What Max doesn't know, is that Tom never learned to do maths, regardless of the reasons he had.

The word I tried to use, was uneducated, instead of ignorant.
If we take the human as Jean-Jacques Rousseau (philosopher) described, as a fresh and simple-minded individual, he would not know
how to do mathematics. If we put this human into a scheme of our current modern society, he would be called stupid, even if he is simply uneducated.

I hope you understand my point now :P