Who is a stupid? Is it the opposite of an intelligent? Then what is intelligence? Teachers, neighbours, relatives, even parents who act as self-appointed gatekeepers of our intellectual citadel assume the role of evaluating and endorsing human potential. They pronounce the ‘differently-abled’ and the ‘so-called-mis-fits’ to be intellectually ostracised?
Stupidity is an invention of the civilised. The concept of ‘stupidity’ does not exist in the wild. Have you ever heard of a “stupid deer” of “smart panther”? They act and re-act on instinct. It is only in a human society, we have a concept of dumb or a smart ‘sapience’.
And the tagging happens early on, right in the childhood, an then it becomes a self-fulfilling prophecy.