Bullfighting is very entertaining to watch, the same as cockfighting and dogfighting. People don't recognise the facts that these are animals that were born to fight and kill each other, or in the bull's case, to attack the matador. It is something they love to do. It is their favorite pastime.
Bullfighting is a cultural, artistic practice. It is something that has been ingrained in the culture since the beginning of the culture, and it is filled with frivolity and ceremony. However, it is also cruel. Although it is culturally rooted and very significant and unifying to the culture as a whole, that does not make the ritual murdering of a bull with swords any less grotesque.
Regardless of whether one supports bullfighting or not, there is no denying that it is a cultural and artistic practice. Bullfighting is steeped in tradition and ceremony featuring performers and intricate costumes. Many countries and regions consider it to be essential to their heritage. It may or may not be a positive cultural practice, but it is a cultural practice.
Culturally, this is definitely a practice and it has historically been a nice show with a ceremony at the end. It is also ingrained in the culture. However, it is not accurate to call bullfighting an art; it is an entertainment due to the slaughter that happens to the bull. They guy who posted "It may or may not be a positive cultural practice, but it is a cultural practice" forgot that the question also asked if the practice is "artistic". Due to the killing of the bull in an inhumane way that takes a tantalizing 2 days of preparation and torture, including vaseline in the eyes of the bull to induce anger, this is not considered an art, but it is definitely a cultural tradition. An art is "the expression or application of human creative skill and imagination", and slaughtering an animal with 2 day of torture as preparation is not an application of human creative skill and imagination.