I got resentment at one point for working 4x10s instead of 5x8s like the rest of the office. Because I "didn't have to work Fridays". That's true, I didn't, but I still worked the same number of hours. I even had to close up the office most of the time because everyone else left before me.
The resentment must've built up enough, even though I had supervisory permission, because once the office got a new supervisor, I was forced to go back to 5x8s. This was a huge problem for me transportation wise, but the boss didn't care, because it "wasn't fair to everyone else". The thing about the 4x10s though - the original boss didn't mind if other people wanted to work that schedule too. Her only issue was that people needed to cover their tasks. Occasionally I did come into work on Fridays, despite the 4x10s I already worked that week, because my work dictated it. So it's not like people didn't have a choice. People just like to complain.