I think one contributing factor is that discernment, critical thinking, and even applied pessimism are all good qualities for a programmer. Many of us get grum

I think one contributing factor is that discernment, critical thinking, and even applied pessimism are all good qualities for a programmer. Many of us get grumpy because we are on high alert for such extended periods. We are looking for bugs and issues. We are objecting to proposals, finding fault, raising negative points. It's a critical mode of thinking, so we accept being critical. Or grumpy. So when some other human is the source of the bug or blocking issue then we don't take care to be social and delicate. That's broken, that's badly built, hey that sucks. Or just channeling other pent up annoyances onto whoever is around.