[mamon]

My experience is the opposite: in one of my previous jobs, due to some circumstances that I will skip here, I became not only grumpy but outright rude. I would literaly insult people, calling them stupid during daily Scrum meetings, never did anyone any favor before loudly complaining "can't you just do that yourself?" first, and so on, and so on.

Guess what? it actually made my life easier, took some workload off me and earned me some respect (or maybe just fear, but who cares?) among my coworkers. I think it also was a factor for me getting a significant salary raise :)