Have you heard what's going on in the US recently? Especially among kids?
How perfect is your English that you get to throw stones, anyway?
This is not about throwing stones. It a matter-of-fact and generally well known fact across the world.
https://au.answers.yahoo.com/question/index?qid=20131215085434AAJd2BT
I won’t address your comment about my English since this is not a proper forum to brag about spoken and written English for those used to speech, cadence, and grammar as taught in Oxford universities.