It’s not just language change, it’s a lazy degradation of the language. ‘I was like…, he was like…’, ‘can I get…’, ‘I’m good’ just projects the speaker as not very bright, doesn’t read much and is unable to put together an interesting or funny sequence of sentences.
Utter tripe. All this tells me is that you have a significant bias based on how someone speaks. Many young people that I work with speak differently, have accents or include “like” in their sentences – it may come across as “not very bright” to you, but I can assure you, many of them are. Many are simply unaware of how they speak until it’s pointed out to them. When you do that, they change. Alternatively, and what I see quite often is that when these “not very bright people” enter a new professional environment, they quickly (and unconsciously) change their style of speaking to match their new environment. I really hope you don’t get to interview people.