He didn’t destroy her stance, but she was embarrassed and her stance eroded.
The key point, which slipped by under-stated, was that to tax “the rich 1%” at 100% would only garner $1T, which isn’t enough for her demands - much less all the other “entitlements” currently under-funded.
Your main point remains: positions have been chosen, and on the whole won’t change until there are all-out ... festivities ... to eliminate one side or the other.
She tried to claim that there was STILL a 1% rich class in Greece that can fix things there.......she is delusional.