Stephen Fry loves language so much that he wants to wrestle it away from the control of the pedants who want to control it.
You slip into a suit for an interview, and you dress your language up too. You can wear what you like linguistically or sartorially when you are at home or with friends but most people accept the need to smarten up under some circumstances. It’s only considerate.
But please! People! For the love of God! Learn the difference between loose and lose!