Culture consists exclusively of a group's art, music, dance, food, language and dress. Cultural groups are generally mutually exclusive of one another. Cultural traits tend to have a genetic base. In general, people who speak the same language are members of the same cultural group. People are usually aware of all of the rules of their culture.
Culture is expressed exclusively by one's verbal behavior.
The only significant components of one's oral language are vocabulary and rules on pronunciation and grammar. Standard English is the correct way to speak at all times. There are universal norms for acceptable communicative behavior within the United States. If a student violates the school's cultural or communicative norms, it is almost always the act of defiance. In general, speaking a nonstandard dialect suggests low cognitive development.