Nobody may be advocating for it, but it happens due to lazy parenting. I heard one 10 year old on the bus a few months ago tell another about his age “Suck my dick!”.
When I was his age I’d never heard such phrases. I wouldn’t even know TO say that. They hear it from whatever media, whether its tv, or youtube, or movies. Nobody is saying anyone is doing this in person, but lazy parenting leads to it happening.