The pedagogy point didn't get explained and harped on well enough.<p>How you interact with people, the words you use, the grammatical and dialect choices you make, and the tone you take all influence how people see you. Being able to put the "standard, professional English" face on your work and interaction is an incredibly valuable skill. Various flavors of vernacular English, casual address, and informal rapport isn't incorrect, wrong, or inappropriate - it just doesn't have the same sort of effect on the people who will later demand a particular sort of interaction with you.<p>In short, there's communication habits that will make it incredibly difficult to maintain white-collar employment, and one of the things that college does is teach students to use white-collar professional communication habits.