Cultural Difference or Deficit?

The video with the man teaching students "Proper English" and pronunciation is demonstrating a cultural deficit--he has no understanding that preserving a culture is an "okay" option. Speaking a certain way with family and peers is absolutely something that can be accepted, and something of which to be proud. He made me feel horrible for the students he was teaching, pointing out their seemingly inconceivably incorrect language skills and pronunciation--when the students were merely speaking in the way they were taught to with friends. The only way this could even feel acceptable to me is if he were explaining to the students that it is acceptable to use this language when it is appropriate--slang and specific dialects are acceptable in the right conditions.
This leads into the code-switching video--as long as one knows when it is appropriate to use slang and when to switch to a more formal type of language, why "correct" the language? It is in itself a language with grammar, syntax, and meaning--not something to be conformed to a "proper" way of speaking.  The second video showed an acceptance of the cultural differences in language speakers and learners. When surrounded by a large group of people who speak a certain way, it is inevitable to use similar styles of speaking--it is not incorrect. Language is a way of communicating: if the message is sent and received, there should be no question that effective communication occurred. People tend to believe that unless we speak in a unified language we will never be able to communicate effectively--however, if we can be more understanding of our surroundings and the people with whom we speak, we can all become more effective communicators and humans in general.