That's not what confirmation bias is, and there's no evidence that they're "banding together." There's no evidence of them planning anything.
When a ref knows you as a dirty, highly penalized, etc etc team, they are going to be subconsciously inclined to call more penalties. They may not know they're doing it. They don't have to be conspiring together for this to happen. That's what confirmation bias is. "I know this team to be dirty, so I think that's a dirty play" is the subconscious thought process.
The explanation of the refs conspiring in a huddle to exact retribution is crazy talk.