Are UX designers tired of the heap of design jargon floating around?

Yep. And it can get to people’s nerves if someone keeps using that very heap of design jargon in their conversation. Everyone knows about the terms and names; you don’t need to keep emphasising on them to show that you’re super smart and know everything about UX. This mostly happens with people who are textbook and theoretical in nature; the people who learn all the jargon by heart but don’t how to apply those terms in practical scenarios. In the real world, no one really cares about all that. When dealing with clients or when working on a real-time project, the lesser time you spend on dazzling your client with the fancy terminology and working on coming up solutions and ideas, the better. Nobody has the time to listen to your extensive library of design jargon; people require their work to be done.