In my old job at a pub which rarely saw a youthful clientele, I heard numerous "stories" or opinions on many matters. Most people today keep things short and sweet most of the time. Maybe text speak is some form of secret protest. Or they're still lazy fucks.
Either way whenever there's an older person "in the house", the word 'yeah' has never been used so often. Although I like to keep things fresh with some 'of course/hell yeah/I don't blame ya mate' etc.