Stupid is as stupid does.

A smart person can understand a stupid person's ideas, what makes him smart is that he recognizes why those ideas are flawed.

So, Rodney is failing his classes in high school, and it is time for the big graduation, but the principal doesn't see how he can give Rodney a diploma. So, the principal and Rodney are on stage in front of the crowd.

Principal: "Rodney I am going to ask you a question, if you get it right you can get your diploma and you can graduate. What is 9 - 7?"

Rodney: "3"

Crowd: "GIVE RODNEY ANOTHER CHANCE!"

Principal: "Ok Rodney, how about 5+3?"

Rodney: "3"

Crowd: "GIVE RODNEY ANOTHER CHANCE!"

Principal: "Rodney, this is your last chance, what is 1+2?"

Rodney: "3"

Crowd: "GIVE RODNEY ANOTHER CHANCE!"

No one knows how another person's mind works. Yet a smart person has a quicker and more active brain, then a stupid person, so anything that's a stupid person to come to the conclusion of, the smart person could come to the conclusion quicker. Meaning whatever the idea that the stupid person had the smart person would have already greased over that idea and came to a better one.

I can't see your point of view That it takes stupid to know stupid as you put it because In a test result you only score low levels and high levels...Just because someone isn't as intelligent as a high IQ leveled person doesn't defy as stupid because stupid is an insult and is undefinable... As you put a "Stupid" person could very well help you out if you were in an argument they could state the obvious or they could be skilled in something that you can't do... There a "slow" people that take abit of teaching and explaining to help them understand but doens't justify there ability to do other things the enjoy doing... You point is invalid...

Sooo since I know it's stupid to think that I could drive in reverse up a wall, over a 90 degree angle and park on the ceiling with no help from any other force, then that makes me stupid?

Assuming stupid people are those with low IQ:

Their ideas and the way they think about the world is what we call stupid. Other 'stupid' people cannot understand these views well because they don't have the cognitive skills to do so, however they may agree with them because they lack the ability to reason things sensibly. However, people who are 'smart', 'bright' etc are keen enough to understand even the stupidest of ideas because of their awesome analysis skills, but they don't necessarily agree with them.