Good Villain Discussion: Analyzing and understanding all the things that led up to the villain being the way they are and appreciating them for what they are and analyzing the villain’s morality and sense of what makes them think they’re doing the right thing in their eyes (even though they’re usually not).
Bad Villain Discussion: Dismissing any and all antagonistic characters as flat, sneering caricatures and accusing anyone who enjoys to analyze villains as being bad people for whatever the reason.
Really Bad Villain Discussion: Attempting to condone every last thing the villain has done, insisting they have done nothing wrong, and possibly trying to paint them as a victim.