4. They are not rigid or unchanging

I really do not agree with this, because as times change, stereotypes must as well, as again, the hamburger eating, shotgun owning American would not have been around before the popularity of hamburgers or the invention of firearms. Also, as the world becomes smaller and people can view other cultures more often, older stereotypes die out, such as the view of all Brits being posh, tea drinking, Victorian style people being less believed not among other nations.