There is no such thing as a stupid person. All people have the same DNA coding which makes up the information that has produced their brain. All human beings have the same brain, same mechanics, same general construction. The only exception would be someone who suffers from an injury of some kind.
Something that makes people different than others is trained behavior. A person who thinks they are smarter than other people, believes that because of trained behavior.
This same idea follows with gay people. Gay people are only gay because of trained behavior. This has been proven with science.
The idea that someone is smart, or the idea that someone is stupid is an illusion. This deception has caused violence all over the world.