chronically online
dismissive
the one-line answer
Someone who has spent so much time online they have lost perspective on normal life.
Chronically online describes someone whose worldview has been so shaped by internet culture that they cannot relate to normal life anymore. They know every meme, every discourse, every drama. They find basic things hard to explain to normal people.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
observation
he genuinely did not understand why that joke wasn't funny irl. chronically online.
He has lost the ability to gauge what works outside of internet spaces.
03 / don't confuse
similar, not the same.
chronically online
Chronically online is the condition
vs
terminally-online
Terminally online is a slightly more severe version.