I see two basic versions of the “stay in your lane” thing. One is about being a responsible instructor and not making stuff up about things you don’t know about, which is the useful one Brannon LeBouef of NOLATAC Training & Consulting talks about here. It allows room for growth, like when he talks about broadening your lane.

The other version is when it’s used to shut people down, like a slightly more “tactical” version of “shut up, dweeb, I don’t have to listen to you”. More common, less useful.

h/t Kathy Jackson of Cornered Cat