Do people become assholes when they move into management or were they assholes the whole time but can now be one openly with no repercussions?

God I hate work. I don't understand the desire or even the reason someone would be just openly hostile, rude, or condescending over a mistake that literally has no consequence and has never been fully explained or documented on the “correct” way to move through a task. Fuck, why is simply living so depressing?