At work at the moment, I hate bubbly smiley work colleagues as it is a clear sign that they are not horrifically overworked and I am jealous and bitter.
Fully appreciate IABU though 
I am one of the “brittle facade” people who put on a happy smiley face with my direct reports but I can’t keep it up with my fellow managers and end up crying with them.
(Yes I am looking for a new job but it’s fucking impossible where I live and DP won’t move or let me retrain)