This whole "the youth is getting dumber" schtick has been a thing since before babylonian times. Youth wants to express itself and the easiest way to do so is language. You used your own slang terms when you were young. Slang that your parents rolled their eyes to. But now that you're one of the eye-rollers, it all seems so much more idiotic to you.The renders are great, but man, the dialogue is painful to read through. Does the current generation genuinely talk like this, or is the dev. just mocking it all? It's difficult to tell, which generally isn't a good sign.
Anyway, this game still uses too much slang. Wait for the "Dialogue & Incest Patch" to be updated. It smoothens things out and reduces the amount of slang considerably for people uncomfortable with it - which includes me. Understanding something doesn't mean you must like it.