I think the negotiation signal being sent by "all jargon" is "fuck off". It's not an attempt to gauge what level the other person is using. It's a blank wall, being thrust towards them.
What's wrong with asking their level of experience with the topic?
Sure, with parents you know the level. I'm talking "other strangers" you meet outside of a context where some familiarity would be expected (like at a conference one might assume at least some form of knowledge and ability to just have the other person ask about specific jargon they don't know).
But at the parents dinner party, that other guy may or may not be in your line of work. Just ask them.
Nothing. That's precisely the point. Giving a wall of jargon, isn't asking if someone is familiar.
meta: I hate how hn culture lately makes people assume that what was obviously a statement in support of a premise was somehow an argument. I get it, around here it is rational enough. Still weird.