Sterotype
The most obvious sign of ignorance. Often used by teenagers, and is carried on in to adulthood.Most commonly it is a mass rationalation encompasing an entire group based on phyisical appearance, race, dress, or other exterior features.
"She's wearing a pentagram, she must worship the devil!"
"Black people are such criminals."
"Preps are so stuck up."
"Man,Goth kids are fucking weird."