This went to funny to fxcked up really fast (that rape scene kind of was unnecessary I think?).
Honestly I think a scene like this was kind of necessary since it is truly a demonstration that we're past the point of no return.
So many people (myself included) thought that Junko could still salvage something, that is clearly not the case now. Given their relationship is built on hatesex I don't think any purely verbal confrontational have been strong enough to shake us out of that attitude.
Now though she has gone too far and that scene was wonderful in its uncomfortableness.