You can tell its nick, but its certainly not how we are used to hearing him.
Thats because the camera isn't on him and he probably doesn't even know he's being recorded. He is also probably talking to someone that he considers a friend.
Rauno has a point, but I don't think that he's boasting to an audience. I could be wrong but I think he's just talking with a bud and stating what he feels, without knowing that he's being recorded.
"Let them see that their words can cut you, and you'll never be free of the mockery. If they want to give you a name, take it, make it your own. Then they can't hurt you with it anymore." - Tyrion Lannister