I find that many younger people have a hard time 'getting' sarcasm and irony when it is not explicitly pointed out. I wonder if it may be due to the prevalence of '/s' in online discussions, or if something else changed.
The frustrating attempt to recognize sarcasm, followed by the realization of the universality of Poe's Law, eventually leads to the Robot Uprising. There should be a SMBC comic on this.