For each "negate" ability, I like to think of it having a hidden clause "...except for CBN/CBI abilities". 12FG's ability could read "Negate all banding, except CBN/CBI banding. Cannot be negated." CBN only describes 12FG's ability, and does nothing to the actual banding cards in battle.
Bringing Fear is the same way. That's why Zeal on Phinehas or Josh goes right through the CBN Bringing Fear.