>I'm curious, would it have bothered you as much if he'd just said: "I'm sick of this blog and I'm quitting it?" because that's basically what he did, except he promised to come back (I wonder if he'll regret that promise in six months).
Yes, this is exactly how he should have phrased it. "Burnt out" is a very strong term that refers to a state of extreme mental anguish induced by an unreasonable and inescapable level of overwork. It feels insulting and sneeringly privileged coming from someone whose job is to surf the internet for a few hours a day and sometimes post about it.
It is as if someone unironically described themselves as "severely clinically depressed" after their favorite sports team lost a game, or someone in the top 1% sincerely calling themselves "impoverished" after a slight cut to their yearly bonus (or the recent bloodbath in the stock market).