Employers, teachers, even friends and family make subjective judgments about you based on a variety of issues, many of which have already been pointed out in this list. One of the major items is your use of language. Speaking proper English gives a person a polished edge. While there are certain cultural contexts where the use of Ebonics is fine, generally, it's best to use correct English when writing a report or going to a job interview. Otherwise, people will think that you're sloppy and undisciplined. I know that it's not fair to make such judgments, but that's just the way of the world. The way you speak doesn't really say much about how a person is on the inside.
