You don't look stupid to me......maybe a little twisted, twixter.  Just kidding.

stupidity, according to who ? those that differ from your genius.

Did you take a poll to know that the majority do or are you just assuming based on your circle of friends?  

I don't think that's an accurate statement. However, the word stupidity is appropriate at times.  

Like all things in the eye of the beholder…the world reaches out to make all your dreams come true or at least appear to be that way. See the world as beautiful and the world will look with awe on your beauty…See the world as intelligent and gifted and those very terms will be applied to you by those who barely know you. Life is yours to experience and finding shortfalls in others makes the same for you. Choose a happy world to see and know as your own also. Seek and find. Everything you’ll ever need or desire to have is here and in your hand as soon as you accept it into your hand. 

I guess i'm with the minority..

Do you have an inferiority complex? Come down from your high horse and join the crowd.

In the words of Forest Gump, "Stupid is, as stupid does."  I think he also said, "Life is like a box of chocolates...you never know what you're going to get!" Kind of like the answers your question seems to have evoked...bet you didn't expect those responses!

Because they are stupid.

Please exhibit and explain your analytical research to support your conclusion !