When irony becomes indistinguishable from sincerity it becomes post-irony. It has become mighty prevalent in the 21st century due to the rise of autism which makes it harder to distinguish between irony and sincerity. When someone says "I guess I'll just die" when complaining about unaffordable medical, housing, retirement, and living costs, the statement itself is true but the person saying it does not say it in earnest. It's gallows humor, not nihilism. Nihilism completely forgoes humor which is what irony is, a nihilist would say "I want to die" when faced with the sane situation.
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