I don't get what's wrong here. The Bernie Bro was spouting far-left talking points and Clinton corrected him.
Being an idealist doesn't mean that everyone should accept your version of reality.
What was that big thing that happened in 07-08? I can't remember what it was called... uh, something about unregulated banks and a financial meltdown that wiped out pension funds and tanked the global economy... damnit, what did they call it... you know, that thing that got so bad that they even one country - I think it was Rome, or Athens, or Sparta, something like that, I can't remember - that even had to default on its debt in the aftermath of the crisis, things were so bad in the global financial system. Damn, man, my memory is just totally shot.