Obviously inside the cage you will try to knock out your opponent or finish him, it is a combat sport. But outside of the cage you can be very polite and educated.
Fedor and JDS, they are both relentless machines inside the cage, however outside of it, they are nothing but absolutely classy and respectful.
The Diaz brothers really love to make provocations before and during the fights. They talk shit, they taunt the opponents, they act like complete douchebags. Of course they do that to sell the fight and to play mind games with the opponent.
Everyone has his way of behaving.