I never got it. How was a "bullfight" a "fight" when the bull always lost?
It's barbaric and should be outlawed like dog fighting and cock fighting. Only trash cheers this kind of stuff.
It is steeped in the past, I can see how 400 years ago, maybe it was an accepted custom but we live in modern times.
As said, Spain's 2nd city, the Catalonian city of Barcelona has outlawed bullfighting.
More milder forms might be acceptable; one's that don't kill the animal.