oblivisumption
A stupid belief that you're the only one who's clueless and everyone else is doing stuff your way without realizing it, like thinking everyone else can party all night and still function like a human.
"I stayed up till 3 AM, why are you still tired?", said by someone who drinks 12 beers and still claims they're fine.
"I texted you 5 times, why didn't you reply?", said by someone who texts in all caps and doesn't know what a period is.
"I left the party at 1 AM, why are you still here?", said by someone who showed up 2 hours late and still thinks they're on time."