You ever get done with a weekend, and dread going back to work not because you hate your job, but because you'd have to be around people?
I'm a relatively social person most of the time, but I feel a constant rising annoyance with just being around other people. In the olden days, weekends involved being at home with just my wife, but now that we've got a socially active son doing all kinds of activities we're always out doing things. The long and short of it is that my "people meter" never gets reset.
When I worked from home, this wasn't a real problem since at home I never really got enough human interaction to even show up on my meter during the week, so no amount of human interaction on the weekend could possibly bother me, and even if I was close to being overwhelmed, Monday and the start of the workweek was close at hand.
Not getting that release and feeling like the next person to talk to you might get yelled at is almost as frustrating as just being around people. At work yelling at coworkers might be a career-limiting move.
I'm not really sure why I feel the need to share my own mental demons with y'all. Maybe I'm trying to find a new way to reset my meter, maybe I'm trying to let people know that if I'm in a bad mood, it may not be anything they have control over, I'm just done with people for a while.