I had an older/seemingly quite skilled bike mechanic look at my bike, who was happy to deal with my vague gestures about squeaky doohickeys and answer any questions. They knew enough to know what normal people don’t know, though, and how to get from there to what matters.

I think the sort of lingo-centric scoffing “expertise” is a defensive posture that near-novices tend to take, to scare off further questions. You see it in every field, and we should all be careful not to replicate it in our own.