I'm not sure what the bull situation has to to with your, "don't get attached to food animals" philosophy. I'm in complete agreement that one shouldn't look on food animals as pets, or get attached to them in anyway. I get that.
But the bull was hardly a pet. It was just an object of fun. If it gets killed during the process, it's lost. If it wins, hurting the matador, or whoever, in the process, it gets slaughtered anyway, lost again.
The meat of the dead animal goes to the local market and sold in most instances so in a way the bull could be looked at as a food animal, very much like your chickens, ducks and rabbits when you were young.
But I bet your animals, destined for the table, were never subjected to tortuous games solely for the pleasure of you and your father.
Or maybe I'm just misunderstanding your point.