I have heard about such incidents.I feel sorry for those who still believe trendy and costly out fits are the key to one's talent.
Don't judge a book by it's cover!
Look at any language other than your mother tongue as a communication medium. You can Learn English by practicing it daily. But for those who think English is owned by them, you don't have to worry. Just leave them.
True words, English is a communication medium for us we can easily learn it by regular practice. There some people who think of themselves as a genius because they can speak English fluently, In fact, they are the biggest jokers as you said we shouldn't worry about them.