You want to sound smart next time you’re at a tech demo? Learn to ask this question, “Yes, but does it scale?” Try to arch your eyebrows just a bit, so that you look skeptical but perhaps also hopeful.
If they answer yes, and start talking in technical language way over your head, you say: “I’ll be interested in seeing that play out under real-world conditions.”
If they say, “How do you mean?”, you say: “I think you’ve just answered my question.” (Then spin on your heel and get out. No further conversation can possibly go well at this point.)