I think some people, even in younger generations, don't know what 'chill' really means. They see it as laziness, because the idea of not 'producing value' every waking moment actually scares them. That fear is the driving force of their lives. They don't have the imagination/empathy/experience to see past it; and judge people (including themselves!) through that lens.
It's deeply unfulfilling, I'm sure, and not just for boomers.