No it isn’t.
Bulls are colourblind – they don’t ‘see red’, so they must be getting angry due to some other reason. I have a radical theory that the bull becomes a little irate because some guy in a tight spangly outfit wearing a Mickey Mouse hat is waving a massive rag in their face – and all this after the guy’s mates have just been stabbing the bull with pointy sticks. Only a theory though – I can’t truly know what the bull thinks or how he sees. So, what is it like being colourblind?