How long do you want to stay and close tonight?

Sorry in advance for formatting. I'm on mobile and this stuff is hard to figure out. Also, I also posted this on r/pettyrevenge as I wasn't sure where it would fit best. Hope that's okay.

So I've worked at a popular fast food chain for quite a while now, but even so, there's this one manager and her little crony, let's call them Sarah (manager) and Sally (crony), who insist, every single time we work together that Sarah has to explain to me, in detail, how to do my job. "This is how you take orders," "this is how you wash dishes," etc.

Well, about a week ago, I got pretty fed up with it. I was just done. I know how to do my job and everyone knows that I know how to do my job. I frequently get scheduled for pre-close shifts (right before the store closes) because I'm good enough that I make the closers job a lot easier when I pre-close. And that night, I was pre-closing for Sarah. Perfect opportunity.

Store policy is that inexperienced persons are not allowed to wash dishes by hand (even though it makes it 10x faster to do so while you use the washer simultaneously), as the head honchos don't want anything not getting washed good enough. So, since Sarah obviously thinks I'm inexperienced, I decide I'm just gonna wash dishes via the dishwasher, even though doing so is so much slower. But I wouldn't want to break any rules, right? Cue the end of my shift, literally maybe a fifteenth of what I would have gotten done had been done, and today, a week later, I learned that after everyone else left, Sarah and Sally had to stay until the openers started showing up in order to complete what I didn't do, since they don't do that stuff very often and are pretty slow at it.

Most satisfying moment of my life was to learn that today.

Edit: spelling, grammar, etc