Martial arts, Boxing, MMA. This is not the place where it is accepted to speak about friendship. All the same, when two fighters are in the ring, no one expects them to do dramatic hugs at the end or something. They are taking part in beautiful, artful combat, with true blood.
However, the word 'art' would not be applicable to these sports, without one thing. Athletes must give each other respect and, what may be even more important, should show an example of correct behaviour in the ring.