This rash of schools banning certain types of non-standard language use is worrying

It suggests that non-standard equates to WRONG and devalues language variety. By suggesting that a blanket ban is necessary to enable students to learn to "switch off" their dialect or sociolect and only use it when it is "appropriate" suggests that it is not appropriate generally. What other prescriptivist views are we hearing lately?

http://uk.news.yahoo.com/primary-school-bans-the-black-country-dialect--because-it-s--damaging--to-pupils-and-shows-a--decline-in-standards--144542450.html#TeCOJST