I was lucky I didnt faced this dumb attitude of locking others out of conversation. My experience from my early days is that seniors used jargon, but made sure that everyone understands what is means without any kind of shaming.

That's why I always considered jargon as useful. It is just some kind of model of point of wiew on some part of reality that we already agreed on (and must be clear to everyone in conversation). There is a saying "all models are wrong, some are useful". And critical thinking helps you determine if the presented model is useful in your context... or anywhere at all.

So I think it is good to understand some jargon, so you can determine if it fit your needs and brings any value, also you can be the hero who makes sure everybody understands.