He kicks Silva's knee and celebrates - Silva was lying on the ground in pain. This is disrespectful, unnecessary. Celebrate the victory but be respectful, you nobody. You are in front of the undisputable number one GOAT and in his own soil, show some respect. You got booed because you deserved, the people there owe you nothing. The opposite, you are lucky that Silva, the great one that doesn't have nothing more to prove, fought you.