It is ambiguous. It could be literal or sarcastic.
Student or Learner
What is the following in red saying?
Terry Gross: I'm not here to prove that I'm smart---
Gene Simmons: Not you---
Terry Gross: I'm not here to prove that you're not smart or ...
Is it saying "of course, you are not smart," or "you are not here to prove that you are smart?"
I imagine it is sarcastic.