"So that's what I sounded like..."
Between classes I work at a grill on campus, making burgers and fries. Note that these are much better than McDonald's burgers and fries. But that's beside the point. Recently, a more senior employee returned, someone who has worked there longer than I have and may have worked in food service before. In other words, someone who knows more than me.
I'm not slow or incompetent and I follow the food safety standards in both letter and spirit. But there are things that she knows that I don't, such as slightly better technique for burgers to make them a little bit better. Nothing dramatic, but worth knowing. So it's not as if she's nitpicking every damn little pointless detail. There's someone else who does that, who I do not believe has ever smiled.
It's annoying to me. The thought process is something along the lines of this: I'm doing an adequate job and have little incentive to improve beyond that, please stop bothering me.
Which brings me to my opening line: "So that's what I sounded like..." That's me. Or was me. I was the person telling people who were doing well enough that they weren't doing this little thing right. Change this thing or that thing. It's not that I was wrong or that all of it was trivial and pointless, but damn, it's annoying being on the other side!
The real kicker may be the triviality of it all: a burger joint, a trivialized heroic. In the context, performance improvements just don't mean much. But some people just cannot keep their damn mouths shut and have to point out everything. It's mentally painful for us to not point out the deficiencies of others and sometimes we're lucky enough to be in an area where we are the experts of the trivial task. For her it is food. For me it was WoW. And damn are we annoying.