"Uh, they're web technologies... in very high demand."
"Yes, but is there a difference between them? What kind of web technologies are they?"
Long pause.
The background silence changes a little, as though a hand were placed over the telephone's mouthpiece.
I can't hear the word in the conversation he's having, but it's clear that he is talking to someone.
The hand goes away.
"Java is a general purpose computer programming language with concurrent objects, and JavaScript is the script version."
Pause.
"Did I get that right?"
Next time you should respond, "Hmm...that's not what I have here. The answer is, 'JavaScript uses Electron and Java uses Spring.' I'm sorry, I don't think you're a great fit for us. Best of luck and have a good day."
Then hang up, and kill two birds with one stone in the process: the tone-deaf recruiter finally understands how the buzzword bingo interview feels, and you have one less incompetent recruiter to deal with.