Should Slang Be Banned?

Should Slang Be Banned?

Debate:
http://eastnorfolklanguage.blogspot.co.uk/2015/09/should-slang-be-banned.html

Manchester school slang ban:
http://eastnorfolklanguage.blogspot.co.uk/2015/09/mind-your-slanguage.html

In my opinion I think that slang should be banned from the classroom, mainly because over using words that are not correct English could mean that you slowly incorporate it into more professional work, for example school work. What is gained by abbreviating words? NOTHING! There is a time and place to use slang and its not at school! School is the time where you can show off your potential and intelligence, and most importantly be the best you can be.
Although some people may argue Shakespeare used forms of slang in his plays, but don't you think we are taking it too far? The amount of stupid slang words that are getting added to the oxford dictionary is ludicrous. why is slang so important to us? People feel the need to shorten words for example 'bruv' instead of 'brother'. Personally I feel like slang is an easy way for people to come across as lazy, uneducated and quite rude if spoken in the wrong scenario. This makes it defiantly not suitable for a learning environment.
There have been people in the past who incorporate slang into documents like a job application! this is only going to show the employer your lack of basic English. examples like that show how easy it is to add slang to your vocabulary making it easier to make mistakes.

http://www.bbc.co.uk/news/uk-11420737 - Actress Emma Thompson expresses her thoughts on slang.